Fun for nerds

[soldar]

Degaussing battleships. More complicated than I thought.

[RoGeorge]

Trapping An Electron In a Box
The Action Lab



 

[RoGeorge]

Why 10,000 volts at altitude is a BAD IDEA
Strange Parts



 


Image from:  https://en.wikipedia.org/wiki/Paschen's_law

[soldar]

This Aussie woman explains HV DC power transmission but her videos do that thing they do now of taking the image from a second camera while she still looks at the first camera so she is not looking at the camera which is recording. I find that annoying and stupid.   Other than that the video is interesting.

Electricity Across Oceans: Is HVDC the Future?




Why is China Dominating Ultra High Voltage DC

[mendip_discovery]

... but her videos do that thing they do now of taking the image from a second camera while she still looks at the first camera so she is not looking at the camera which is recording. I find that annoying and stupid.

This goes back to when we would watch documentaries and they would interview an 'Expert'. Plus some find the staring eyes of a crazy Aussie just a little unnerving.

[soldar]

... but her videos do that thing they do now of taking the image from a second camera while she still looks at the first camera so she is not looking at the camera which is recording. I find that annoying and stupid.

This goes back to when we would watch documentaries and they would interview an 'Expert'. Plus some find the staring eyes of a crazy Aussie just a little unnerving.

I understand it when a person is interviewing another person and each one is being recorded by a dedicated camera so they are talking and looking at each other and not at the camera. Then I understand I am an onlooker, a spectator.

But if the video is recorded with the person addressing the camera directly then it should remain that way and if the camera location changes the person should look at the new camera and not keep talking to... nobody.

It irritates me to no end.  I feel like yelling "Hey!  I am HERE!"

[RoGeorge]

Franck Hertz Experiment
xofunkox-scientific experiments

This is a tube for the Frank-Hertz experiment. It can be used to determine the discrete energy level of the electrons. The tube is heated to approx. 180°C, which causes sufficient mercury to be present in the vapor phase. The accelerating voltage (cathode-grid anode) is then slowly increased from 0 to 60 volts. Approx. 1.3 volts counter voltage is applied between the grid electrode and the collecting electrode.
The electrons that emerge from the hot cathode are accelerated by the field. At a certain speed, they interact with the gas molecules and are slowed down. If they are accelerated again ... . If the highest speed before they interact with the gas is just before the grid, some fly through the grid, overcome the 1.3 volt opposing field and hit the catcher. This current flow, which generates several current maxima at the catcher with increasing acceleration voltage, can be represented graphically. The distance between the current maxima is typically 4.9 volts for mercury.

 

[BrianHG]

[RoGeorge]

Magnifying The World's Brightest Flashlight (200,000 Lumens)
The Action Lab



Conservation of Etendue 

[Sal Ammoniac]

Magnifying The World's Brightest Flashlight (200,000 Lumens)
The Action Lab




Conservation of Etendue 

Great! Now kids can burn ants with magnifying glasses at night.

[RoGeorge]

Stolen link from Doctorandus_P in https://www.eevblog.com/forum/projects/online-course-hardware-disign/msg5578019/#msg5578019

[LIVE] How to Achieve Proper Grounding - Rick Hartley - Expert Live Training (US)
Altium


 


Same author, more slides, but requires to watch the above 2h video first:

Keys to Control Noise, Interference and EMI in PC Boards - Hartley
Altium
https://youtube.com/watch?v=ZYUYOXmo9UU

[Sal Ammoniac]

Here's how you achieve proper grounding:

[RoGeorge]

Tar Pits Are a Death Trap. Except for This Fly. | Deep Look
Deep Look



 

[RoGeorge]

Building a $2,000,000 machine in 2 months
Breaking Taps



 

[RoGeorge]

Is It Possible To Eat Electricity?
The Action Lab



 

[RoGeorge]

Nuclear waste is reusable. Why aren’t we doing it?
DW Planet A



 

[RoGeorge]

As seen on https://hackaday.com/2024/08/28/demonstrating-the-photoelectric-effect-using-neon-lamps/

Harnessing Light: Photoelectric Effect, Neon Lamps, and Oscillators
Ashish Derhgawen



 

[RoGeorge]

Part 1 of semiconductors physics

The Actual Reason Semiconductors Are Different From Conductors and Insulators.
ProjectsInFlight



 

[RoGeorge]

Part 2 of semiconductors physics

Doping: The Most Important Part of Making Semiconductors
ProjectsInFlight



 

The other 5-6 videos on the same YT channel show good progress on the path of fabricating DIY chips:
https://www.youtube.com/@projectsinflight/videos

[BrianHG]

That Alien Message.

[RoGeorge]

How a 16th Century Explorer's Sailing Ship Works
Animagraffs



 

[SiliconWizard]

Here's how you achieve proper grounding:

Ah, absolutely.

[themadhippy]

Thats obviously for fixed equipment,theirs also the version designed for portable supplies.

[RoGeorge]

The BIG PROBLEM With Wire Cutters Manufacturers Don’t Want You To Know
OUTDOORS55



 

[RoGeorge]

Why did our brains [as a species] shrink?
Stefan Milo



 



LATER EDIT  2024-10-25:
====================
YouTube being YouTube, at some point has removed this video for the reason of "This video has been removed for violating YouTube's Terms of Service". 

The hypothesis discussed there was that human self-domestication might have caused the brain shrinkage in the human species.

On this episode of A Life In Ruins Podcast, we have our good friend and frequent collaborator Stefan Milo on the podcast. Stefan is in the process of researching for a video on human brain size, and we talk about what he has found. Researchers have noted a decrease in brain size in humans within the last 30,000 years. We take a deep dive into how brain size has changed throughout the evolution of the genus Homo and potential reasons for the decrease in brain size. We talk about the possibility of human self-domestication and the theories surrounding it.

Quoted from https://www.archaeologypodcastnetwork.com/ruins/105