Hewitt-Drew-it! 100. Circuit Medley

A summary of electric circuits.

How to See Without Glasses

A pinhole can replace a lense.

 

What Does Sound Look Like?

You can actually see sound waves as they travel through the air thanks to a clever photographic trick: Schlieren flow visualization

A Polarizing Discovery About the Big Bang!

How the first transistor worked

Bill uses a replica of the point contact transistor built by Walter Brattain and John Bardeen at Bell Labs. On December 23, 1947 they used this device to amplify the output of a microphone and thus started the microelectronics revolution that changed the world. He describes in detail why a transistor works by highlighting the uniqueness of semiconductors in being able to transfer charge by positive and negative carriers.

 

Relativity Isn't Relative

Several important quantities are not relative.