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General => General Chat => Topic started by: RoGeorge on October 20, 2018, 05:40:07 pm

Title: Fun for nerds
Post by: RoGeorge on October 20, 2018, 05:40:07 pm: https://abstrusegoose.com/578
Title: Re: Fun for nerds
Post by: Ampera on October 20, 2018, 06:27:57 pm: Pretty neat except for the password part, which even through tearing apart the underlying scripts, I can't find the password for, so either I am missing something obvious, or just stupid.

edit: found it out, as it turned out I was stupid.
Title: Re: Fun for nerds
Post by: onesixright on October 20, 2018, 08:35:38 pm: Cool.
Title: Re: Fun for nerds
Post by: Macbeth on October 20, 2018, 08:40:14 pm: This was fun until the password stage. I tried all the obvious including 'hunter2' then decided this is no fun whatsoever and had a brief dip into the javascript but couldn't find anything worth my time so ended it there.

ETA: Did another run through and it's obvious what the password is, no digging through code needed. :-DD
Title: Re: Fun for nerds
Post by: RoGeorge on October 20, 2018, 10:25:55 pm: I spent some time, too, looking under the hood for that password. :horse:
Then I was :palm: :-DD

Interactive comics is something very original, never seen such a thing before.

As for the rest of the comics, Abstruse Goose is brilliant. I don't know anybody to be better. Look:
https://abstrusegoose.com/482
https://abstrusegoose.com/587
https://abstrusegoose.com/183
https://abstrusegoose.com/249
https://abstrusegoose.com/297
https://abstrusegoose.com/324
https://abstrusegoose.com/562
Title: Re: Fun for nerds
Post by: Ampera on October 20, 2018, 10:45:49 pm: One thing I did find, if you are particularly bored, is that the maze's collision detection is pretty broken, so if you just try at the right angle, you can go through all the walls, and even exit outside the map. After looking at the source code, as it turns out, it's actually using a raycasting engine, something pretty neat for JavaScript.
Title: Re: Fun for nerds
Post by: NiHaoMike on October 20, 2018, 11:32:48 pm: Yet another xkcd?
Title: Re: Fun for nerds
Post by: Mr. Scram on October 20, 2018, 11:34:37 pm: This is broken to the point of not doing anything on the various devices I tried it on. It seems to not cope very well with any blocking of any kind.
Title: Re: Fun for nerds
Post by: sokoloff on October 21, 2018, 01:29:34 am: Works OK for me on Mac OS Chrome 69.0.3497.100 with uBlock Origin. That blocked two Google syndication ads, so it doesn't seem like it's littered with crapware.
If you have Javascript disabled, well, it's a Javascript puzzle so yeah that's not going to work.
Title: Re: Fun for nerds
Post by: RoGeorge on October 28, 2018, 07:51:34 am: Just Excel

https://www.youtube.com/watch?v=r9PLmtQZwmY (https://www.youtube.com/watch?v=r9PLmtQZwmY)

:)
Title: Re: Fun for nerds
Post by: RoGeorge on November 04, 2018, 04:39:30 pm: ~~Plateau's Rotating Drops, Euler-Lagrange Equations and Bifurcations~~
Satisfying ^-^

https://www.youtube.com/watch?v=yC8rybHKVY8 (https://www.youtube.com/watch?v=yC8rybHKVY8)
Title: Re: Fun for nerds
Post by: RoGeorge on January 14, 2019, 10:08:50 pm: You got five days!

https://www.youtube.com/watch?v=HEfHFsfGXjs (https://www.youtube.com/watch?v=HEfHFsfGXjs)

::)
Title: Re: Fun for nerds
Post by: RoGeorge on February 14, 2019, 08:14:18 pm: https://www.youtube.com/watch?v=BQM_gbSbIug (https://www.youtube.com/watch?v=BQM_gbSbIug)

:D
Title: Re: Fun for nerds
Post by: RoGeorge on March 12, 2019, 08:56:00 pm: https://www.youtube.com/watch?v=97t7Xj_iBv0 (https://www.youtube.com/watch?v=97t7Xj_iBv0)
Title: Re: Fun for nerds
Post by: apis on March 12, 2019, 09:29:09 pm: That RCS thruster control mechanism was ingenious.
Title: Re: Fun for nerds
Post by: edy on March 15, 2019, 02:11:04 am: Quote from: Macbeth on October 20, 2018, 08:40:14 pm
This was fun until the password stage. I tried all the obvious including 'hunter2' then decided this is no fun whatsoever and had a brief dip into the javascript but couldn't find anything worth my time so ended it there.

ETA: Did another run through and it's obvious what the password is, no digging through code needed. :-DD

Yes same here, I rummaged around for the code in Javascript, ended up even finding some pages here:

https://abstrusegoose.com/sa-comics/578/scripts/login_scripts/login.js (https://abstrusegoose.com/sa-comics/578/scripts/login_scripts/login.js)

I looked and looked and ended up guessing the password anyways... I won't give away the secret, except to say we have read some of the same Sci-Fi books. ;) Still, just as an exercise I am still curious where the compare is being done to see where they stored the password (or are they doing it via calculation which would be a better way to obfuscate it rather than just a string).
Title: Re: Fun for nerds
Post by: RoGeorge on March 25, 2019, 09:01:44 am: https://upload.wikimedia.org/wikipedia/commons/6/6b/SquareWaveFourierArrows.gif

(https://upload.wikimedia.org/wikipedia/commons/6/6b/SquareWaveFourierArrows.gif)

Arrows are the fundamental frequency plus the first five harmonics of a square wave.
Magenta dot is the sum of them. Blue dot is the ideal square wave. Looks funny.

;D
Title: Re: Fun for nerds
Post by: T3sl4co1l on March 25, 2019, 10:16:55 am: The classic, https://xkcd.com/356/ ;D

Tim
Title: Re: Fun for nerds
Post by: RoGeorge on March 26, 2019, 08:53:06 pm: https://www.youtube.com/watch?v=RCi8MXWhdvY (https://www.youtube.com/watch?v=RCi8MXWhdvY)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on April 01, 2019, 07:41:56 am: Move along, move along, nothing to see here!

https://www.youtube.com/watch?v=Vwjcn4Vl2iw&t=523 (https://www.youtube.com/watch?v=Vwjcn4Vl2iw&t=523)

(experimental fun with microwaves starts at 8:43 - never before seen them all in one place)
^-^
Title: Re: Fun for nerds
Post by: BrianHG on April 01, 2019, 09:15:31 pm: Quote from: RoGeorge on March 26, 2019, 08:53:06 pm
https://www.youtube.com/watch?v=RCi8MXWhdvY (https://www.youtube.com/watch?v=RCi8MXWhdvY)

:o
Wholly crap, I had no bloody idea at all that this was even near possible by any means at all.
Title: Re: Fun for nerds
Post by: Gyro on April 02, 2019, 12:46:44 pm: Quote from: RoGeorge on April 01, 2019, 07:41:56 am
Move along, move along, nothing to see here!

https://www.youtube.com/watch?v=Vwjcn4Vl2iw&t=523 (https://www.youtube.com/watch?v=Vwjcn4Vl2iw&t=523)

(experimental fun with microwaves starts at 8:43 - never before seen them all in one place)
^-^

Classic stuff, I remember being taken to a Chemistry lecture at the Royal Institution while at senior school. The Christmas lectures were required viewing in our household.

I had forgotten Mr Coates, he was a permanent fixture at the Royal Institution lectures for many, many years! https://www.rigb.org/our-history/people/c/bill-coates (https://www.rigb.org/our-history/people/c/bill-coates)
Title: Re: Fun for nerds
Post by: RoGeorge on April 05, 2019, 01:27:08 pm: Vooom-Vooom-Vooom-Vooom! ;D

https://www.youtube.com/watch?v=W-6WYGnBMSU (https://www.youtube.com/watch?v=W-6WYGnBMSU)
Title: Re: Fun for nerds
Post by: Neilm on April 05, 2019, 04:42:06 pm: Filming the speed of light https://www.youtube.com/watch?v=7Ys_yKGNFRQ (https://www.youtube.com/watch?v=7Ys_yKGNFRQ)
Title: Re: Fun for nerds
Post by: RoGeorge on April 06, 2019, 11:07:21 am: 8) Party!

https://www.youtube.com/watch?v=B4EyQQ-Nubw (https://www.youtube.com/watch?v=B4EyQQ-Nubw)
Title: Re: Fun for nerds
Post by: tpowell1830 on April 06, 2019, 06:32:25 pm: A bit of a mix of electrical, electronic, mechanical, 3d printing, machining and kinematics. This is the latest of a long series, episode #15. James does all sorts of projects, but this project is the most sciencey one IMO.

https://www.youtube.com/watch?v=KN4wAZHtbzc (https://www.youtube.com/watch?v=KN4wAZHtbzc)
Title: Re: Fun for nerds
Post by: RoGeorge on April 08, 2019, 10:39:19 pm: Qute Fourier visualization (interactive): http://www.jezzamon.com/fourier/index.html (http://www.jezzamon.com/fourier/index.html) :)
Title: Re: Fun for nerds
Post by: RoGeorge on April 09, 2019, 10:59:17 pm: "Aluminium has a relatively low melting point (660°C) but its boiling point (2470°C) is very high. The parabolic shape (funicular curvedes) which the wire takes on when it is heated ensures that the oxide shell does not break. When reducing the current, the wire always breaks." :o

https://www.youtube.com/watch?v=SbdwuuzzYqQ (https://www.youtube.com/watch?v=SbdwuuzzYqQ)
Title: Re: Fun for nerds
Post by: RoGeorge on April 14, 2019, 11:01:17 am: Watch it to the end, full screen (35 seconds)

https://www.youtube.com/watch?v=I_88S8DWbcU (https://www.youtube.com/watch?v=I_88S8DWbcU)

Woobl ! ;D
Title: Re: Fun for nerds
Post by: RoGeorge on April 14, 2019, 06:34:57 pm: This rainbow is on fire! ;D

https://www.youtube.com/watch?v=T-bnHRaxiSQ (https://www.youtube.com/watch?v=T-bnHRaxiSQ)
Title: Re: Fun for nerds
Post by: RoGeorge on April 15, 2019, 11:23:15 am: https://www.youtube.com/watch?v=VxMM4g2Sk8U (https://www.youtube.com/watch?v=VxMM4g2Sk8U)

::)
Title: Re: Fun for nerds
Post by: RoGeorge on April 27, 2019, 02:27:58 am: Solving EQUATIONS by shooting TURTLES with LASERS

https://www.youtube.com/watch?v=IUC-8P0zXe8 (https://www.youtube.com/watch?v=IUC-8P0zXe8)

^-^
Title: Re: Fun for nerds
Post by: RoGeorge on April 30, 2019, 07:35:05 am: https://www.youtube.com/watch?v=gQXUQRFNhUw (https://www.youtube.com/watch?v=gQXUQRFNhUw)

;D
Title: Re: Fun for nerds
Post by: RoGeorge on May 01, 2019, 06:47:01 am: A hardware guy writing software:

https://www.youtube.com/watch?v=EumR6luhwME (https://www.youtube.com/watch?v=EumR6luhwME)

A software guy doing hardware:

https://www.youtube.com/watch?v=HMNZnNZA9U0 (https://www.youtube.com/watch?v=HMNZnNZA9U0)

If it didn't work, use SPICE:

https://www.youtube.com/watch?v=5W_FxUFvwwc (https://www.youtube.com/watch?v=5W_FxUFvwwc)

^-^
Title: Re: Fun for nerds
Post by: RoGeorge on May 02, 2019, 02:57:46 pm: Yet another Marangoni effect

https://www.youtube.com/watch?v=0h16Tyn2138 (https://www.youtube.com/watch?v=0h16Tyn2138)

:)
Title: Re: Fun for nerds
Post by: edy on May 03, 2019, 07:09:23 pm: Quote from: RoGeorge on April 27, 2019, 02:27:58 am
Solving EQUATIONS by shooting TURTLES with LASERS

Thanks for sharing that video, this Mathologer guy is now one of my favourite channels to watch! Pretty cool stuff and he's funny for a mathematician! I just watched one where he talked about squaring triangles and how to prove certain square roots are irrational! Mind blown!
Title: Re: Fun for nerds
Post by: apis on May 04, 2019, 05:59:26 pm: Mathologer is my favourite maths channel, no competition.
https://youtu.be/qS4H6PEcCCA
Title: Re: Fun for nerds
Post by: T3sl4co1l on May 04, 2019, 10:30:37 pm: I'd have to place 3blue1brown higher, but it's hardly a competition, they're both well worth watching. :D
Title: Re: Fun for nerds
Post by: apis on May 05, 2019, 01:04:09 pm: Yeah, 3blue1brown is also quite good, very nice animations... ... if Mathologer is Batman then 3b1b is Robin. ;)
Title: Re: Fun for nerds
Post by: RoGeorge on May 07, 2019, 04:39:57 pm: SurfaceSight: A New Spin on Touch, User, and Object Sensing for IoT Experiences

https://www.youtube.com/watch?v=pLWdvpg8BMg (https://www.youtube.com/watch?v=pLWdvpg8BMg)

^-^
Title: Re: Fun for nerds
Post by: RoGeorge on May 11, 2019, 12:04:47 pm: https://www.youtube.com/watch?v=uxPdPpi5W4o (https://www.youtube.com/watch?v=uxPdPpi5W4o)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on May 12, 2019, 07:06:09 pm: Thank ebastler for this one:

https://www.youtube.com/watch?v=0CEpT_A19qI (https://www.youtube.com/watch?v=0CEpT_A19qI)

:clap:
Title: Re: Fun for nerds
Post by: apis on May 15, 2019, 06:08:51 pm: https://www.youtube.com/watch?v=kocnm8xpoJc (https://www.youtube.com/watch?v=kocnm8xpoJc)
Title: Re: Fun for nerds
Post by: RoGeorge on May 19, 2019, 06:15:01 pm: Q: What's the most comfortable umbrella during rain?
A: A chain armor, of course!

https://www.youtube.com/watch?v=QoIfjLXVQ98 (https://www.youtube.com/watch?v=QoIfjLXVQ98)

;D
Title: Re: Fun for nerds
Post by: RoGeorge on May 21, 2019, 07:24:07 pm: You are never alone!

https://www.youtube.com/watch?v=YW2eGaUzq7E (https://www.youtube.com/watch?v=YW2eGaUzq7E)

:scared:
Title: Re: Fun for nerds
Post by: RoGeorge on May 25, 2019, 07:53:54 am: https://www.youtube.com/watch?v=B-9LE6b-SYw (https://www.youtube.com/watch?v=B-9LE6b-SYw)

:o
Title: Re: Fun for nerds
Post by: soldar on May 25, 2019, 03:44:48 pm: The Bulwer-Lytton Fiction Contest (https://www.bulwer-lytton.com/) challenges writers to write a really bad opening sentence for a novel.

2005 winner:
Quote
As he stared at her ample bosom, he daydreamed of the dual Stromberg carburetors in his vintage Triumph Spitfire, highly functional yet pleasingly formed, perched prominently on top of the intake manifold, aching for experienced hands, the small knurled caps of the oil dampeners begging to be inspected and adjusted as described in chapter seven of the shop manual. — Dan McKay

2007 winner:
Quote
Gerald began – but was interrupted by a piercing whistle which cost him ten percent of his hearing permanently, as it did everyone else in a ten-mile radius of the eruption, not that it mattered much because for them “permanently” meant the next ten minutes or so until buried by searing lava or suffocated by choking ash – to pee. — Jim Gleeson, Madison, WI
Title: Re: Fun for nerds
Post by: RoGeorge on June 05, 2019, 02:54:05 am: Quote from: Psi on June 03, 2019, 05:20:53 am
Fun website where guy trained an AI to understand the relationship between 2000 images of cats and their line art equivalents.
You can draw a cat diagram and have the AI turn it into a real cat photo, or at-least try too :-DD

https://affinelayer.com/pixsrv/ (https://affinelayer.com/pixsrv/)

Note: On some computers the website doesn't work. I think it uses some CPU extensions not found in older processors, or maybe it uses CUDA for all the AI processing.

(https://www.eevblog.com/forum/chat/post-a-picture-of-a-cat!/?action=dlattach;attach=753666;image)

Go ahead and try to sketch you own cat. Be creative, even unconventional.
See? ;D
Title: Re: Fun for nerds
Post by: RoGeorge on June 12, 2019, 04:33:55 pm: https://www.youtube.com/watch?v=4Jvi7vfgSgQ (https://www.youtube.com/watch?v=4Jvi7vfgSgQ)

:D
Title: Re: Fun for nerds
Post by: RoGeorge on June 13, 2019, 06:21:03 pm: https://www.youtube.com/watch?v=eYga8cdUSnM (https://www.youtube.com/watch?v=eYga8cdUSnM)

8)
Title: Re: Fun for nerds
Post by: RoGeorge on June 15, 2019, 06:09:26 am: https://www.youtube.com/watch?v=5WdLV3YRMvw&t=1100 (https://www.youtube.com/watch?v=5WdLV3YRMvw&t=1100)

If you want just to hear HAARP sounds, it's at minute 18:20 :)
Title: Re: Fun for nerds
Post by: Arjunan M R on June 15, 2019, 01:49:05 pm: Quote from: edy on March 15, 2019, 02:11:04 am
Quote from: Macbeth on October 20, 2018, 08:40:14 pm
This was fun until the password stage. I tried all the obvious including 'hunter2' then decided this is no fun whatsoever and had a brief dip into the javascript but couldn't find anything worth my time so ended it there.

ETA: Did another run through and it's obvious what the password is, no digging through code needed. :-DD

Yes same here, I rummaged around for the code in Javascript, ended up even finding some pages here:

https://abstrusegoose.com/sa-comics/578/scripts/login_scripts/login.js (https://abstrusegoose.com/sa-comics/578/scripts/login_scripts/login.js)

I looked and looked and ended up guessing the password anyways... I won't give away the secret, except to say we have read some of the same Sci-Fi books. ;) Still, just as an exercise I am still curious where the compare is being done to see where they stored the password (or are they doing it via calculation which would be a better way to obfuscate it rather than just a string).
Any more clues for the password.
Having a hard time figuring it out. :( ???
Title: Re: Fun for nerds
Post by: RoGeorge on June 15, 2019, 03:24:35 pm: If we could just know the answer to everything, then we will know this password, too. ^-^
Title: Re: Fun for nerds
Post by: RoGeorge on June 16, 2019, 05:47:25 pm: A French dude during Napoleon times was trying to calculate how the heat spread in a metal plate. What could go wrong?

About quarter of millennia later:
- 5G
- mobile phones
- WiFi
- mp3, Photoshop, CGI special effect
- digital oscilloscope, SA, VNA
- MRI, NMR
- crystallography, LHC
- astronomical spectroscopy
- insert almost whatever here ...

The dude's name was Fourier.

https://www.youtube.com/watch?v=ToIXSwZ1pJU (https://www.youtube.com/watch?v=ToIXSwZ1pJU)

^-^
Title: Re: Fun for nerds
Post by: RoGeorge on July 31, 2019, 01:26:26 am: https://www.av8n.com/physics/ (https://www.av8n.com/physics/)
Title: Re: Fun for nerds
Post by: RoGeorge on August 17, 2019, 05:17:46 pm: https://www.youtube.com/watch?v=k0B8N-rmce8 (https://www.youtube.com/watch?v=k0B8N-rmce8)

:-DMM
Title: Re: Fun for nerds
Post by: RoGeorge on August 20, 2019, 06:47:51 am: Rename the attached video from ".webm.png" to ".webm" only, then play it.

Fun? OK.
;D

Now play it in a loop, while looking at the yellow wheel.
The yellow wheel turns, suddenly stops, then rotates again.
Who's locking the wheel?
:o

This is how it should look, but still, seeing it is mesmerizing.
Relativity of the observer at its finest.
^-^

[attachimg=2]
Title: Re: Fun for nerds
Post by: RoGeorge on September 04, 2019, 09:37:25 am: https://www.youtube.com/watch?v=51usJ74pPP8 (https://www.youtube.com/watch?v=51usJ74pPP8)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on September 06, 2019, 07:52:53 am: https://www.youtube.com/watch?v=sd3xNHMUDUw (https://www.youtube.com/watch?v=sd3xNHMUDUw)

:)
Title: Re: Fun for nerds
Post by: RoGeorge on September 19, 2019, 05:27:46 pm: https://www.youtube.com/watch?v=1VPfZ_XzisU (https://www.youtube.com/watch?v=1VPfZ_XzisU)

Totally bamboozled! :o
Title: Re: Fun for nerds
Post by: RoGeorge on September 24, 2019, 05:46:46 pm: https://www.youtube.com/watch?v=sC4MjPKf3jY (https://www.youtube.com/watch?v=sC4MjPKf3jY)

Mastering Slavery 101 ::)
Title: Re: Fun for nerds
Post by: RoGeorge on September 27, 2019, 08:40:21 pm: https://www.youtube.com/watch?v=3PwAQZNLy0I (https://www.youtube.com/watch?v=3PwAQZNLy0I)

^-^
Title: Re: Fun for nerds
Post by: RoGeorge on October 02, 2019, 05:53:11 pm: https://www.youtube.com/watch?v=9Jrd5kJ-vTU (https://www.youtube.com/watch?v=9Jrd5kJ-vTU)
Title: Re: Fun for nerds
Post by: RoGeorge on October 09, 2019, 10:12:49 am: https://www.youtube.com/watch?v=EK32jo7i5LQ (https://www.youtube.com/watch?v=EK32jo7i5LQ)

???
Title: Re: Fun for nerds
Post by: RoGeorge on October 10, 2019, 04:08:14 pm: https://www.youtube.com/watch?v=mt3P9rJmIOQ (https://www.youtube.com/watch?v=mt3P9rJmIOQ)

And not to mention Iron Man, too! ;D
Title: Re: Fun for nerds
Post by: RoGeorge on October 11, 2019, 10:48:02 am: https://www.youtube.com/watch?v=zy1BhVhpGN0 (https://www.youtube.com/watch?v=zy1BhVhpGN0)

Smokin' at 4:20! ;D
Title: Re: Fun for nerds
Post by: RoGeorge on October 13, 2019, 08:46:00 pm: "Everything is relative" bamboozles again:

https://www.youtube.com/watch?v=M4-L8UgPkOk (https://www.youtube.com/watch?v=M4-L8UgPkOk)

;D
Title: Re: Fun for nerds
Post by: RoGeorge on October 15, 2019, 05:19:09 am: [attachimg=1]

:)
Title: Re: Fun for nerds
Post by: RoGeorge on October 19, 2019, 03:35:28 am: https://www.youtube.com/watch?v=-bnBbHFfZ6k (https://www.youtube.com/watch?v=-bnBbHFfZ6k)

::)
Title: Re: Fun for nerds
Post by: RoGeorge on October 27, 2019, 03:53:14 pm: A one minute video puzzle:

https://www.youtube.com/watch?v=9fwzf1WtAE8 (https://www.youtube.com/watch?v=9fwzf1WtAE8)

:-DMM
Title: Re: Fun for nerds
Post by: RoGeorge on October 29, 2019, 07:48:40 am: Very high resolution selfie of Curiosity on Mars (~10MB and 250MB): https://photojournal.jpl.nasa.gov/catalog/PIA23240
~10MB https://apod.nasa.gov/apod/image/1910/ClayCache_Curiosity_9990.jpg (https://apod.nasa.gov/apod/image/1910/ClayCache_Curiosity_9990.jpg)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on November 02, 2019, 11:36:33 pm: https://www.youtube.com/watch?v=W65JhGY-z6Y (https://www.youtube.com/watch?v=W65JhGY-z6Y)

:)
Title: Re: Fun for nerds
Post by: RoGeorge on November 07, 2019, 01:33:04 am: https://www.youtube.com/watch?v=4pxYVlgSzCg (https://www.youtube.com/watch?v=4pxYVlgSzCg)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on November 19, 2019, 07:11:56 pm: https://www.youtube.com/watch?v=XXN9HjLJvdc (https://www.youtube.com/watch?v=XXN9HjLJvdc)

8)
Title: Re: Fun for nerds
Post by: RoGeorge on November 21, 2019, 12:31:14 am: https://www.youtube.com/watch?v=K-Fc08X56R0 (https://www.youtube.com/watch?v=K-Fc08X56R0)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on November 23, 2019, 06:52:29 pm: 8) A new type of electronic component, the BiZen transistor:

[attach=1]

Circuit symbol for the Bizen (Bipolar-Zener) transistor showing the input which uses the quantum tunneling effect. (Image: SFN)
https://www.eetimes.com/document.asp?doc_id=1335216# (https://www.eetimes.com/document.asp?doc_id=1335216#)

https://hackaday.com/2019/11/23/new-part-day-the-bizen-transistor/ (https://hackaday.com/2019/11/23/new-part-day-the-bizen-transistor/)
Title: Re: Fun for nerds
Post by: RoGeorge on November 25, 2019, 01:36:24 pm: Stolen from de∫hipu:
:D
Title: Re: Fun for nerds
Post by: RoGeorge on November 30, 2019, 09:07:22 pm: https://www.youtube.com/watch?v=nIKhUizkXxA (https://www.youtube.com/watch?v=nIKhUizkXxA)

8)
Title: Re: Fun for nerds
Post by: RoGeorge on December 02, 2019, 08:30:40 pm: Lab with a quantum computer:

https://www.youtube.com/watch?v=1tbC3p1YYvU (https://www.youtube.com/watch?v=1tbC3p1YYvU)

(it only makes sense after reading their papers) ::)
Title: Re: Fun for nerds
Post by: RoGeorge on December 07, 2019, 03:20:24 pm: A real tale with spies and physicists and H-bomb plans lost in a train. 8)
https://phys.org/news/2019-12-hydrogen-secrets.html

Original article
https://physicstoday.scitation.org/doi/10.1063/PT.3.4364
Same content, PDF magazine scan
https://physicstoday.scitation.org/doi/pdf/10.1063/PT.3.4364
Title: Re: Fun for nerds
Post by: RoGeorge on December 14, 2019, 03:56:27 pm: https://www.youtube.com/watch?v=QRt7LjqJ45k (https://www.youtube.com/watch?v=QRt7LjqJ45k)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on December 20, 2019, 12:03:58 pm: https://www.youtube.com/watch?v=_z-SUo2wP4I (https://www.youtube.com/watch?v=_z-SUo2wP4I)

^-^
Title: Re: Fun for nerds
Post by: RoGeorge on January 07, 2020, 07:25:40 pm: https://www.youtube.com/watch?v=pMjXAAxgR-M (https://www.youtube.com/watch?v=pMjXAAxgR-M)

:o

About the same info as text:
https://hackaday.com/2020/01/07/the-oldest-nuclear-reactor-natures-2-billion-year-old-experiment/ (https://hackaday.com/2020/01/07/the-oldest-nuclear-reactor-natures-2-billion-year-old-experiment/)

A photo of such a nuclear reactor
Oklo: Ancient African Nuclear Reactors
https://apod.nasa.gov/apod/ap100912.html (https://apod.nasa.gov/apod/ap100912.html)
Title: Re: Fun for nerds
Post by: RoGeorge on January 09, 2020, 11:10:33 pm: https://www.youtube.com/watch?v=99u53V7uDFY (https://www.youtube.com/watch?v=99u53V7uDFY)

:-+

Interesting paper about another subject, correcting RF leakage:
Scalar Network Analyzer Leakage Correction, by Ted Yapo
https://drive.google.com/file/d/132w56treJsABD6a_0f7Oilfb4Dvm1751/view (https://drive.google.com/file/d/132w56treJsABD6a_0f7Oilfb4Dvm1751/view)
published in https://journal.hackaday.io/current (https://journal.hackaday.io/current)
Title: Re: Fun for nerds
Post by: RoGeorge on January 10, 2020, 10:41:56 pm: [attachimg=1]

;D
Title: Re: Fun for nerds
Post by: RoGeorge on January 12, 2020, 09:48:15 pm: Old gems:

https://www.youtube.com/watch?v=EMO3dZAizb4 (https://www.youtube.com/watch?v=EMO3dZAizb4)

:)
Title: Re: Fun for nerds
Post by: RoGeorge on January 17, 2020, 12:57:13 am: https://www.youtube.com/watch?v=dqMYWldfs_k (https://www.youtube.com/watch?v=dqMYWldfs_k)

:)
Title: Re: Fun for nerds
Post by: RoGeorge on January 28, 2020, 07:48:09 pm: Q: - What animal gives milk?
A: - The fly.

https://www.youtube.com/watch?v=odCtCote9U0 (https://www.youtube.com/watch?v=odCtCote9U0)

:o Tsetse fly.
Title: Re: Fun for nerds
Post by: RoGeorge on January 29, 2020, 04:38:54 pm: https://www.youtube.com/watch?v=k7s1sr4JdlI (https://www.youtube.com/watch?v=k7s1sr4JdlI)

Boston Dynamics' new year resolutions for 2020 are about making a business turn.
Better don't go into law enforcement, BD, don't go there. ::)
Title: Re: Fun for nerds
Post by: RoGeorge on January 31, 2020, 11:46:02 am: https://www.youtube.com/watch?v=nrjbdohloSE (https://www.youtube.com/watch?v=nrjbdohloSE)

Waiting for the first Li-Fu battery in 3, 2, 1, ;D
Title: Re: Fun for nerds
Post by: RoGeorge on January 31, 2020, 11:55:34 pm: Shhhhh! Be vewy, vewy, quiet.
He's gonna say about some wabit.
:P

https://www.youtube.com/watch?v=ovJcsL7vyrk (https://www.youtube.com/watch?v=ovJcsL7vyrk)
Title: Re: Fun for nerds
Post by: 1Ghz on February 01, 2020, 10:22:03 am: https://www.youtube.com/watch?v=2UesaCcfI_8 (https://www.youtube.com/watch?v=2UesaCcfI_8)

Very nice cover
Title: Re: Fun for nerds
Post by: RoGeorge on February 10, 2020, 08:18:11 pm: [attachimg=1]

;D

States of Matter by David L. Goodstein
Title: Re: Fun for nerds
Post by: RoGeorge on February 12, 2020, 02:44:15 pm: The "Deep Look" team is usually doing videos like this:

https://www.youtube.com/watch?v=t3gvx8UQiZA (https://www.youtube.com/watch?v=t3gvx8UQiZA)

now opening a new channel, "PBS Terra", about ANTARCTICA

https://www.youtube.com/watch?v=EvRAuy1ZmTc (https://www.youtube.com/watch?v=EvRAuy1ZmTc)

Subscribed! :)
Title: Re: Fun for nerds
Post by: RoGeorge on February 16, 2020, 03:15:29 pm: https://www.youtube.com/watch?v=feUPkMGACtk (https://www.youtube.com/watch?v=feUPkMGACtk)

:-DD
Title: Re: Fun for nerds
Post by: RoGeorge on February 17, 2020, 02:42:47 pm: Is Hell Exothermic or Endothermic?
https://www.albany.edu/faculty/miesing/teaching/assess/hell.html (https://www.albany.edu/faculty/miesing/teaching/assess/hell.html)

;D
Title: Re: Fun for nerds
Post by: RoGeorge on February 23, 2020, 08:47:33 am: [attachimg=1]

;D
Title: Re: Fun for nerds
Post by: RoGeorge on February 29, 2020, 02:18:26 pm: The opposite of Microsoft Office is Macrohard Onfire. :D
Title: Re: Fun for nerds
Post by: RoGeorge on March 02, 2020, 08:16:35 pm: What comes after USA? USB.
;D
Title: Re: Fun for nerds
Post by: RoGeorge on March 02, 2020, 10:45:30 pm: Wanna see a rocket factory? :)

https://www.youtube.com/watch?v=o0fG_lnVhHw (https://www.youtube.com/watch?v=o0fG_lnVhHw)

https://www.youtube.com/watch?v=DQaPOIQLEUo (https://www.youtube.com/watch?v=DQaPOIQLEUo)
Title: Re: Fun for nerds
Post by: RoGeorge on March 03, 2020, 07:43:12 am: [attachimg=1]

What value is that? :o
Title: Re: Fun for nerds
Post by: bsfeechannel on March 03, 2020, 10:52:07 pm: Quote from: RoGeorge on March 03, 2020, 07:43:12 am
What value is that? :o

I don't know, but R3 is 470Ω.

(https://i.pinimg.com/originals/36/8c/4b/368c4b63a703cf186db0a6950ac1007c.jpg)
Title: Re: Fun for nerds
Post by: RoGeorge on March 22, 2020, 05:06:41 am: (no Catgirls anime, Mousegirls for real) :D
The making of Mouse computer advertising:

https://www.youtube.com/watch?v=fnzyTOT-oDI (https://www.youtube.com/watch?v=fnzyTOT-oDI)
Title: Re: Fun for nerds
Post by: RoGeorge on March 24, 2020, 08:12:00 pm: https://www.youtube.com/watch?v=SPeilSU4lz0 (https://www.youtube.com/watch?v=SPeilSU4lz0)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on April 09, 2020, 09:46:56 pm: Without a Smith chart or a computer, can you do impedance matching and controlled attenuation in your head? :o

https://www.youtube.com/watch?v=geSDcollRos (https://www.youtube.com/watch?v=geSDcollRos)

;D
Title: Re: Fun for nerds
Post by: RoGeorge on April 10, 2020, 09:12:38 am: Terahertz Geometric Diode 8)

https://phys.org/news/2020-04-one-way-street-electrons.html

Ratcheting quasi-ballistic electrons in silicongeometric diodes at room temperature
Science 10 Apr 2020:
Vol. 368, Issue 6487, pp. 177-180
DOI: 10.1126/science.aay8663

[attachimg=1]
Title: Re: Fun for nerds
Post by: RoGeorge on April 17, 2020, 08:45:36 pm: :wtf: Do Gods read Holy Books?

(https://d2r55xnwy6nx47.cloudfront.net/uploads/2020/04/Donald-Knuth_2880_Lede.jpg)

Quanta Magazine: The Computer Scientist Who Can’t Stop Telling Stories (https://www.quantamagazine.org/computer-scientist-donald-knuth-cant-stop-telling-stories-20200416/)
Title: Re: Fun for nerds
Post by: Alphaprot on April 18, 2020, 01:54:05 pm: Yet another idiot (me!) who tried to get the password from the scripts. |O
Title: Re: Fun for nerds
Post by: RoGeorge on April 20, 2020, 04:15:04 pm: A sharpie is 15 times thinner than a human hair. :o

https://www.youtube.com/watch?v=46DBNUfhATo (https://www.youtube.com/watch?v=46DBNUfhATo)

Meh, about 140 millionths of an inch (3.5\$\mu\$m). ;D
Title: Re: Fun for nerds
Post by: SiliconWizard on April 20, 2020, 04:23:09 pm: Hopefully she doesn't keep this for long. I don't think that would do her ear much good.
Title: Re: Fun for nerds
Post by: RoGeorge on April 22, 2020, 01:28:22 pm: https://www.youtube.com/watch?v=5f-JlzBuUUU (https://www.youtube.com/watch?v=5f-JlzBuUUU)

^-^
Title: Re: Fun for nerds
Post by: RoGeorge on May 16, 2020, 09:16:21 pm: A solar water pump with no moving parts :-+

https://www.youtube.com/watch?v=hiN3F_lq9fE (https://www.youtube.com/watch?v=hiN3F_lq9fE)
Title: Re: Fun for nerds
Post by: RoGeorge on May 19, 2020, 08:34:32 am: https://www.youtube.com/watch?v=p1PgNbgWSyY (https://www.youtube.com/watch?v=p1PgNbgWSyY)

8)
Title: Re: Fun for nerds
Post by: RoGeorge on May 30, 2020, 09:29:38 pm: Compared testing and choosing the proper light bulb: :-DMM

https://www.youtube.com/watch?v=9ZV5cGzR-YI (https://www.youtube.com/watch?v=9ZV5cGzR-YI)
Title: Re: Fun for nerds
Post by: RoGeorge on June 05, 2020, 05:47:08 am: https://www.youtube.com/watch?v=rEoc0YoALt0 (https://www.youtube.com/watch?v=rEoc0YoALt0)
Title: Re: Fun for nerds
Post by: RoGeorge on June 07, 2020, 09:08:34 am: Solder on Al with CuSO₄ + NaCl + FeCl₃ 8)

https://www.instructables.com/id/Solder-Electronic-Components-on-Aluminum/ (https://www.instructables.com/id/Solder-Electronic-Components-on-Aluminum/)

https://www.youtube.com/watch?v=Z14aU-PaioA (https://www.youtube.com/watch?v=Z14aU-PaioA)

Or just skip the whole procedure and solder normally, straight on aluminium, like you would do when soldering on a normal copper PCB, except for aluminium soldering you need to keep the soldering point covered in oil, so the oxigen won't reach the aluminium to form aluminium oxide. Aluminium oxide is the one that prevents the solder to stick, and it forms almost instantly in air.

Put a drop of oil on the future soldering spot, scratch a little the aluminium surface under the oil drop in order to remove the invisible oxide, then solder under the oil blob. Solder has no problem sticking on unoxidized aluminium, and the drop of oil stays in the way of atmospheric oxigen to come in contact with the aluminium at the soldering spot.

I've tried soldering under a drop of motor oil and under a drop of cooking oil, both oil worked. Soldered this way on kitchen aluminium foil and on solid aluminium radiators. It works almost as easy as it were copper. Just don't use your best soldering tool, the oil will be hard to remove from the soldering tip. Use a sacrificial tip, or cover it in Al foil for protection.
Title: Re: Fun for nerds
Post by: RoGeorge on June 09, 2020, 09:00:15 am: Capiţa's Pendulum

https://www.youtube.com/watch?v=cjGqxF79ITI (https://www.youtube.com/watch?v=cjGqxF79ITI)

https://www.youtube.com/watch?v=5oGYCxkgnHQ (https://www.youtube.com/watch?v=5oGYCxkgnHQ)

:o

https://en.wikipedia.org/wiki/Kapitza%27s_pendulum (https://en.wikipedia.org/wiki/Kapitza%27s_pendulum)

Pyotr Leonidovich Kapitsa or Peter Kapitza (Russian: Пётр Леонидович Капица, Romanian: Petre Capiţa), Soviet physicist, Nobel Prize in Physics (1978) https://www.nobelprize.org/prizes/physics/1978/summary/ (https://www.nobelprize.org/prizes/physics/1978/summary/)

You probably never heard of his 1/2 of the Nobel Prize in Physics ("for his basic inventions and discoveries in the area of low-temperature physics"), because he was eclipsed by the two dudes that got the other 1/2 prize that year for scratching the pigeon's poop from their antenna in order to remove radio noises, and thus discovering the Big Bang! ;D
(Allan Penzias and Robert Woodrow Wilson "for their discovery of cosmic microwave background radiation.")
Title: Re: Fun for nerds
Post by: RoGeorge on June 21, 2020, 10:52:54 am: The cat is dead, long live the cat! 8)

https://www.youtube.com/watch?v=jDW9bWSepB0 (https://www.youtube.com/watch?v=jDW9bWSepB0)
Title: Re: Fun for nerds
Post by: RoGeorge on June 24, 2020, 10:15:59 pm: https://www.youtube.com/watch?v=suH32X91sQE (https://www.youtube.com/watch?v=suH32X91sQE)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on June 25, 2020, 07:14:30 pm: https://www.youtube.com/watch?v=fcKYTUbIMQM (https://www.youtube.com/watch?v=fcKYTUbIMQM)

>:(
Title: Re: Fun for nerds
Post by: Doctorandus_P on June 25, 2020, 10:19:01 pm: Triple Pendulum on a Cart
https://www.youtube.com/watch?v=cyN-CRNrb3E (https://www.youtube.com/watch?v=cyN-CRNrb3E)
Title: Re: Fun for nerds
Post by: RoGeorge on June 26, 2020, 03:05:52 pm: https://www.youtube.com/watch?v=lLTfMLaX820 (https://www.youtube.com/watch?v=lLTfMLaX820)

Inside tales and unique items from the history of science/technology.
:popcorn:

He also has a very good 101 for metalworking and prototype building on his channel:
https://www.youtube.com/user/dgelbart/videos (https://www.youtube.com/user/dgelbart/videos)
Title: Re: Fun for nerds
Post by: RoGeorge on June 27, 2020, 05:47:44 pm: It's about time ;D

https://www.youtube.com/watch?v=IJhgZBn-LHg (https://www.youtube.com/watch?v=IJhgZBn-LHg)

- Complicated, but OK, got it! :)
- So, what time is it?

https://www.youtube.com/watch?v=-5wpm-gesOY (https://www.youtube.com/watch?v=-5wpm-gesOY)

:palm:
Title: Re: Fun for nerds
Post by: RoGeorge on June 29, 2020, 08:16:25 am: Hangover

https://www.youtube.com/watch?v=re3oEKX6Fks (https://www.youtube.com/watch?v=re3oEKX6Fks)

:phew:
Title: Re: Fun for nerds
Post by: RoGeorge on July 02, 2020, 05:50:14 pm: "Do one thing and do it well". Always loved that.

https://www.youtube.com/watch?v=N2M-p-OGvPg (https://www.youtube.com/watch?v=N2M-p-OGvPg)

A clever design from Leo's Bag of Tricks, a very promising YouTube channel! :-+
Title: Re: Fun for nerds
Post by: RoGeorge on July 11, 2020, 10:53:50 am: https://www.youtube.com/watch?v=WmLh6UvLo14 (https://www.youtube.com/watch?v=WmLh6UvLo14)

;D
Title: Re: Fun for nerds
Post by: RoGeorge on July 20, 2020, 12:40:13 pm: What's with all this recent fuss about measured CMB (Cosmic Microwave Background)?

https://www.youtube.com/watch?v=Y5rZ58Q_0zk (https://www.youtube.com/watch?v=Y5rZ58Q_0zk)

;)
Title: Re: Fun for nerds
Post by: pidcon on July 21, 2020, 05:36:28 am: Filming the Speed of Light at 10 Trillion FPS

https://www.youtube.com/watch?v=7Ys_yKGNFRQ (https://www.youtube.com/watch?v=7Ys_yKGNFRQ)
Title: Re: Fun for nerds
Post by: pidcon on July 21, 2020, 05:37:24 am: World's Deepest-Penetration and Fastest Optical Cameras

https://www.youtube.com/watch?v=mzL6zPivtIQ (https://www.youtube.com/watch?v=mzL6zPivtIQ)
Title: Re: Fun for nerds
Post by: BU508A on July 22, 2020, 08:05:01 am: Which door?
https://www.youtube.com/watch?v=RnNdyCbwzn0 (https://www.youtube.com/watch?v=RnNdyCbwzn0)

"Can you pass the salt, please?"
https://www.youtube.com/watch?v=nORRgU8sGdE (https://www.youtube.com/watch?v=nORRgU8sGdE)
Title: Re: Fun for nerds
Post by: RoGeorge on July 22, 2020, 09:00:57 am: Quote from: pidcon on July 21, 2020, 05:37:24 am
World's Deepest-Penetration and Fastest Optical Cameras

https://www.youtube.com/watch?v=mzL6zPivtIQ (https://www.youtube.com/watch?v=mzL6zPivtIQ)

I didn't know about all the new applications.

It was intriguing that I couldn't find any good brief info about how it works. Yes, the video mentions something about how it works, but doesn't teaches. I've seen a few years ago similar videos with femptosecond cameras, and always wrongly assumed that the principle is similar with that of a sampling oscilloscope, but that is NOT how it works.

The genius of it is that the whole video (like the one with the light passing through a bottle, or the illuminated figurines) is computed out of only one single flash. The video is not produced by taking repeated snapshots at each flash. It is one single flash and one photo, and from there, the time evolution of the light is reconstructed (computed). The movie is calculated, not filmed. At least this is how I understood it so far.

Following the research papers, the working principles of femptosecond cameras originate in some apparently unrelated concepts that were started during WWII, then developed in the following years to improve (chirped) radar and sonar technologies. At first it was about impulse stretching while keeping their shape (in analog domain).

Impulse stretching happens by passing the signal through a diffuser, then mixing the signal with a frequency chirp. By the chirp type, ascending or descending in frequency, the original pulse can be stretched or compressed in time while still keeping its shape. From there, it all went to building time lenses, or the opposite, to strongly sharpen wider pulses without destroying the vacuum tubes or the sonars, and so on. Stretched signals were required to extract more details from the echoes, while compressed signals were required to sharpen the pulses sent to make echoes. The sharper the sent pulses, the more precise the echoes.

Stretching is the first key concept, and from there there are many physics, RF, EE, optics and DSP tricks combined in making femptosecond cameras. I just hope I didn't get it all wrong, still digging. :)

So far it was a fascinating journey down the rabbit hole, thanks for bringing up this subject! :-+
Title: Re: Fun for nerds
Post by: pidcon on July 23, 2020, 07:57:28 am: Hi RoGeorge, I'm glad you liked the video. I was watching a series of videos on mathematics, and slowly the video recommendations on YouTube steered me towards these high-speed camera research. I'm sure there's more interesting videos on other research areas.
Title: Re: Fun for nerds
Post by: chris_leyson on August 02, 2020, 01:38:34 pm: https://www.youtube.com/watch?v=dxPKuxrrG7A (https://www.youtube.com/watch?v=dxPKuxrrG7A)
Title: Re: Fun for nerds
Post by: RoGeorge on August 02, 2020, 11:12:53 pm: How radioactive are bananas and other radioactive foods?

https://www.youtube.com/watch?v=OLdDKb9Bago (https://www.youtube.com/watch?v=OLdDKb9Bago)

:scared:
Title: Re: Fun for nerds
Post by: RoGeorge on August 09, 2020, 09:29:17 am: https://www.youtube.com/watch?v=bG3rvkpDsdg (https://www.youtube.com/watch?v=bG3rvkpDsdg)

:phew:
Title: Re: Fun for nerds
Post by: RoGeorge on August 11, 2020, 09:27:51 am: Steve Collin's Passive Dynamic Robot

https://www.youtube.com/watch?v=AdK7opXqoro (https://www.youtube.com/watch?v=AdK7opXqoro)

No motors, no microcontrollers, just mechanics and gravity :o
Title: Re: Fun for nerds
Post by: RoGeorge on August 13, 2020, 07:54:28 pm: Intuitive explanations for Seebeck and Peltier effects :-+

https://www.youtube.com/watch?v=O6waiEeXDGo (https://www.youtube.com/watch?v=O6waiEeXDGo)
Title: Re: Fun for nerds
Post by: T3sl4co1l on August 13, 2020, 08:57:35 pm: http://markoapparatus.com/portfolio/machine-clock/ (http://markoapparatus.com/portfolio/machine-clock/)
Title: Re: Fun for nerds
Post by: RoGeorge on August 16, 2020, 03:10:45 pm: https://www.youtube.com/watch?v=hG3STsKx3fI (https://www.youtube.com/watch?v=hG3STsKx3fI)

Very long (3 hours and 5 minutes), but it doesn't make much sense unless watched entirely in one go. :)
Title: Re: Fun for nerds
Post by: RoGeorge on August 24, 2020, 04:07:02 pm: https://www.youtube.com/watch?v=l36UkYtq6m0 (https://www.youtube.com/watch?v=l36UkYtq6m0)

Very short (15 seconds), but it doesn't make much sense unless watched entirely in one go. :)

LATER EDIT:
In case you were looking for a high resolution version of the annotated thumbnail of the video, like the one seen before pressing play, use this link format:
Quote
https://img.youtube.com/vi/<insert-youtube-video-id-here>/maxresdefault.jpg

to get this jpg:
(https://img.youtube.com/vi/l36UkYtq6m0/maxresdefault.jpg)
Title: Re: Fun for nerds
Post by: RoGeorge on August 27, 2020, 06:22:32 am: https://www.youtube.com/watch?v=amCsM265Lw0 (https://www.youtube.com/watch?v=amCsM265Lw0)

The guinea pig one is wrong. ::)
Title: Re: Fun for nerds
Post by: T3sl4co1l on August 27, 2020, 08:03:35 am: Quote from: RoGeorge on August 27, 2020, 06:22:32 am
The guinea pig one is wrong. ::)

How so?

It's just a visual version of the old joke:

A mathematician and physicist are standing on one side of a room. On the other side, a prize sits on a pedestal. The host says: "Each time I ring this bell, you may move half the distance to the prize. The first one to get it wins!"
Mathematician: "This is dumb, I'll never get there."
Physicist: "I'll get close enough..."

Or more homologically: an infinite series of patrons walk into a bar. The first orders a beer, the second half a beer, and so on. The bartender rolls his eyes and pours two beers.

Tim
Title: Re: Fun for nerds
Post by: RoGeorge on August 27, 2020, 10:29:02 am: The number of the threads of fur is finite, and also quantified, therefore the halving process cannot go forever.

The infinite halving is possible for numbers from R, but it's not possible for finite numbers from N, for example.
Title: Re: Fun for nerds
Post by: T3sl4co1l on August 27, 2020, 10:41:36 am: Ah yes, an example of this --
https://math.stackexchange.com/questions/250/a-challenge-by-r-p-feynman-give-counter-intuitive-theorems-that-can-be-transl

I can assert my continued correctness by suggesting the figure is a virtual guinea pig, for which the fur might indeed be infinite, or even continuous. It's solid shaded, after all. :P

And also on the subject of approximation, no haircut or shave is perfect, and leaving a few hairs would be a perfectly acceptable outcome (only needing some 14 or so trips to reach). If it went on for a long time, we might note that real hair also grows, so our job might never be complete; this would be best illustrated with a different animal, the yak, the process of shaving for which is, by one definition, never complete. ;D

Tim
Title: Re: Fun for nerds
Post by: RoGeorge on August 27, 2020, 01:11:47 pm: Quote from: T3sl4co1l on August 27, 2020, 10:41:36 am
https://math.stackexchange.com/questions/250/a-challenge-by-r-p-feynman-give-counter-intuitive-theorems-that-can-be-transl

Nice collection! :D

My most recent favorite is not listed there: Can you generate fair heads/tails tossing a slightly biased coin? (von Neumann extractor)
Title: Re: Fun for nerds
Post by: RoGeorge on August 31, 2020, 11:17:31 am: https://www.youtube.com/watch?v=ld-bG1CjkZY (https://www.youtube.com/watch?v=ld-bG1CjkZY)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on September 09, 2020, 03:08:55 pm: https://www.youtube.com/watch?v=x-GBkd1QafM (https://www.youtube.com/watch?v=x-GBkd1QafM)

;D
Title: Re: Fun for nerds
Post by: RoGeorge on September 13, 2020, 06:05:58 am: https://www.youtube.com/watch?v=m0cg3zCVKhM&t=745 (https://www.youtube.com/watch?v=m0cg3zCVKhM&t=745)

Smol osc demo at 12:25 ;D
Title: Re: Fun for nerds
Post by: BU508A on September 13, 2020, 03:11:41 pm: Making sharp knives out of some very strange materials, e.g. eggs, Bismuth, mushrooms, chocolate, tofu ...

https://www.youtube.com/channel/UCg3qsVzHeUt5_cPpcRtoaJQ/videos (https://www.youtube.com/channel/UCg3qsVzHeUt5_cPpcRtoaJQ/videos)
Title: Re: Fun for nerds
Post by: RoGeorge on September 16, 2020, 09:04:25 pm: Might be the next big thing 8)

https://www.youtube.com/watch?v=-t1_ffaFXao (https://www.youtube.com/watch?v=-t1_ffaFXao)
Title: Re: Fun for nerds
Post by: RoGeorge on September 20, 2020, 08:23:26 am: :o

https://www.youtube.com/watch?v=BhjqA8Lmj58 (https://www.youtube.com/watch?v=BhjqA8Lmj58)

The only thing I understood how it works was the ratchet wheel. ;D
Title: Re: Fun for nerds
Post by: RoGeorge on October 01, 2020, 08:44:09 am: https://www.youtube.com/watch?v=48sCx-wBs34 (https://www.youtube.com/watch?v=48sCx-wBs34)

:o
Title: Re: Fun for nerds
Post by: Ed.Kloonk on October 01, 2020, 05:53:28 pm: [attach=1]
Title: Re: Fun for nerds
Post by: RoGeorge on October 08, 2020, 09:51:58 pm: This dude again...

https://www.youtube.com/watch?v=gMAKamGIiMc (https://www.youtube.com/watch?v=gMAKamGIiMc)

:)
Title: Re: Fun for nerds
Post by: RoGeorge on October 20, 2020, 01:14:59 pm: No brain required. ;D

https://www.youtube.com/watch?v=9rxf_2EgwfE (https://www.youtube.com/watch?v=9rxf_2EgwfE)
Title: Re: Fun for nerds
Post by: RoGeorge on October 26, 2020, 07:18:19 pm: Documentary "A video history of Japan's electronic industry":

Birth of The Transistor (Part 1)

https://www.youtube.com/watch?v=ihkRwArnc1k (https://www.youtube.com/watch?v=ihkRwArnc1k)

:o

Circuits in stone (Part 2) (https://youtu.be/uGRNXmWng3M)
The Calculator Wars (Part 3) (https://youtu.be/ansXGewduN4)
The technologial giant of the micron world (Part 4) (https://youtu.be/G40YwOg0_B8)
Title: Re: Fun for nerds
Post by: RoGeorge on November 07, 2020, 10:45:33 am: https://www.youtube.com/watch?v=iKcWu0tsiZM (https://www.youtube.com/watch?v=iKcWu0tsiZM)

;D
Title: Re: Fun for nerds
Post by: RoGeorge on November 11, 2020, 11:03:48 am: ScienceClic (French) (https://www.youtube.com/c/ScienceClic/videos)
ScienceClic English (https://www.youtube.com/c/ScienceClicEN/videos)

Gold! :-+

https://www.youtube.com/watch?v=wrwgIjBUYVc (https://www.youtube.com/watch?v=wrwgIjBUYVc)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on November 16, 2020, 11:59:01 am: So many satellites floating around! Zoom in a little.
https://platform.leolabs.space/visualization

:scared:
Title: Re: Fun for nerds
Post by: RoGeorge on November 16, 2020, 05:28:44 pm: https://www.youtube.com/watch?v=iwj78pR46zM (https://www.youtube.com/watch?v=iwj78pR46zM)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on November 17, 2020, 09:37:48 pm: Screw history ;D

https://www.youtube.com/watch?v=yzMU8rH4PN8 (https://www.youtube.com/watch?v=yzMU8rH4PN8)
Title: Re: Fun for nerds
Post by: RoGeorge on November 24, 2020, 10:33:20 am: https://www.youtube.com/watch?v=bqz65_YfcJg (https://www.youtube.com/watch?v=bqz65_YfcJg)

;D
Title: Re: Fun for nerds
Post by: Ed.Kloonk on November 24, 2020, 04:07:00 pm: Quote from: RoGeorge on November 24, 2020, 10:33:20 am
https://www.youtube.com/watch?v=bqz65_YfcJg (https://www.youtube.com/watch?v=bqz65_YfcJg)

;D

My question is why?

And that needle drop is waaay too slow.

:)
Title: Re: Fun for nerds
Post by: RoGeorge on November 27, 2020, 10:21:50 am: https://www.youtube.com/watch?v=jBPFCvEhv9Y (https://www.youtube.com/watch?v=jBPFCvEhv9Y)

Haltere? ???
Title: Re: Fun for nerds
Post by: Ed.Kloonk on November 27, 2020, 03:01:18 pm: [attachimg=1]
Title: Re: Fun for nerds
Post by: RoGeorge on December 02, 2020, 11:11:51 pm: https://hackaday.com/2020/12/01/extracting-a-gate-from-amd-and-intel/ (https://hackaday.com/2020/12/01/extracting-a-gate-from-amd-and-intel/)

https://www.youtube.com/watch?v=1kQUXpZpLXI (https://www.youtube.com/watch?v=1kQUXpZpLXI)

7nm \$\approx\$ 14nm? :o

Part 1 and 2
https://youtu.be/uEMDkbF3hu0 (https://youtu.be/uEMDkbF3hu0)
https://youtu.be/pYF7Qym9Pq0 (https://youtu.be/pYF7Qym9Pq0)
Title: Re: Fun for nerds
Post by: RoGeorge on December 03, 2020, 12:28:34 am: There are 4 more with even better explanations:

Inside i7-8700K - Scanning Electron Microscope (SEM) Footage (en)
https://www.youtube.com/watch?v=O_iu48VTRDE (https://www.youtube.com/watch?v=O_iu48VTRDE)

From the same channel:

Catching a single Transistor - We're looking inside the i9-9900K: Prep and expensive equipment 1/3, 2/3, 3/3
https://youtu.be/WOZqoTuAGKY (https://youtu.be/WOZqoTuAGKY)
https://youtu.be/VBCtsqs8278 (https://youtu.be/VBCtsqs8278)

https://www.youtube.com/watch?v=TtuUANbaEFI (https://www.youtube.com/watch?v=TtuUANbaEFI)

:o
Title: Re: Fun for nerds
Post by: RoGeorge on December 20, 2020, 03:29:56 pm: https://www.youtube.com/watch?v=C3emGQ2-1uE (https://www.youtube.com/watch?v=C3emGQ2-1uE)

^-^
Title: Re: Fun for nerds
Post by: RoGeorge on December 25, 2020, 12:54:06 am: Time reversed optical waves :o

https://www.youtube.com/watch?v=1WcIejZd__w (https://www.youtube.com/watch?v=1WcIejZd__w)

https://phys.org/news/2020-12-physicists-time-reversed-optical.html (https://phys.org/news/2020-12-physicists-time-reversed-optical.html)
Title: Re: Fun for nerds
Post by: RoGeorge on December 29, 2020, 01:03:36 pm: https://www.youtube.com/watch?v=iqBh7G4uDR8 (https://www.youtube.com/watch?v=iqBh7G4uDR8)

::) Diana Walsh Pasulka: Aliens, Technology, Religion & the Nature of Belief | Lex Fridman Podcast #149
Title: Re: Fun for nerds
Post by: RoGeorge on December 29, 2020, 08:45:56 pm: https://www.youtube.com/watch?v=fn3KWM1kuAw (https://www.youtube.com/watch?v=fn3KWM1kuAw)

;D
Title: Re: Fun for nerds
Post by: Ed.Kloonk on December 29, 2020, 08:54:21 pm: Well, we all know what dancing leads to..

:popcorn:
Title: Re: Fun for nerds
Post by: BU508A on December 31, 2020, 04:35:54 pm: Very nice channel: brusspup

https://www.youtube.com/user/brusspup/videos (https://www.youtube.com/user/brusspup/videos)

Example: the Schlieren Effect:
https://www.youtube.com/watch?v=NmS6h_fkPgk (https://www.youtube.com/watch?v=NmS6h_fkPgk)

Happy New Year 2021 to all of you
Title: Re: Fun for nerds
Post by: RoGeorge on December 31, 2020, 11:59:38 pm: The mind, the conscientiousness and anything else is nothing but a driven illusion. :o

https://www.youtube.com/watch?v=dBap_Lp-0oc (https://www.youtube.com/watch?v=dBap_Lp-0oc)

So, just be nice and enjoy existing. ^-^
Title: Re: Fun for nerds
Post by: RoGeorge on January 05, 2021, 01:44:05 pm: Lissajous (source, https://www.otw20.com/viewtopic.php?p=2101#p2101 (https://www.otw20.com/viewtopic.php?p=2101#p2101))

(http://img1.reactor.cc/pics/post/%D0%B3%D0%B8%D1%84%D0%BA%D0%B8-%D0%B7%D0%B0%D0%BB%D0%B8%D0%BF%D0%B0%D0%BB%D0%BE%D0%B2%D0%BE-%D0%A4%D0%B8%D0%B3%D1%83%D1%80%D1%8B-%D0%9B%D0%B8%D1%81%D1%81%D0%B0%D0%B6%D1%83-6025647.gif)

:scared:
Title: Re: Fun for nerds
Post by: BU508A on January 05, 2021, 02:31:21 pm: Quote from: RoGeorge on January 05, 2021, 01:44:05 pm
On the top row, odd harmonics: f, 3f, 5f, 7f, ... , 19f
On the left column, even harmonics: f, 2f, 4f, 6f, ... , 18f

Are you sure about this? If this would be the case, then you should not have all those circles in the diagonal. Hmmm ...
Title: Re: Fun for nerds
Post by: RoGeorge on January 05, 2021, 05:55:04 pm: Good catch! :-+
Mistake deleted, my bad, sorry.

In the attached animation, both the rows and the columns have all frequencies, from f to 10f.
Title: Re: Fun for nerds
Post by: RoGeorge on January 09, 2021, 09:07:25 am: https://www.youtube.com/watch?v=8XV2-pmiyAg (https://www.youtube.com/watch?v=8XV2-pmiyAg)

:)
Title: Re: Fun for nerds
Post by: Ed.Kloonk on January 09, 2021, 09:27:22 am: It seems as though the moon is tidally locked or something.
Title: Re: Fun for nerds
Post by: NiHaoMike on January 10, 2021, 09:55:21 pm: A look back at EV racing over 3 years ago in Canada:
https://www.youtube.com/watch?v=Hq_PehccY20 (https://www.youtube.com/watch?v=Hq_PehccY20)
At 1:04, how many names do you recognize on the sign?
At 1:41, I think everyone here should recognize what car it is and why it's special.
Title: Re: Fun for nerds
Post by: RoGeorge on January 18, 2021, 06:26:16 pm: The Space Shuttle and the Horse's Rear End
http://www.astrodigital.org/space/stshorse.html (http://www.astrodigital.org/space/stshorse.html)

;D