Science videos

[Probeman]

Here's a wonderful video on the Veritasium YouTube channel of how the blue LED was invented and also an excellent explanation of band gaps:

https://www.youtube.com/watch?v=AF8d72mA41M&ab_channel=Veritasium

[Probeman]

A nice introduction to the history of electron microscopes:

https://www.youtube.com/watch?v=88bMVbx1dzM

Which answers the question: "What if you just keep zooming in?"