How a liquid lens works (electrowetting)

A liquid lens works by changing the shape of a water drop by creating an electrostatic field that pulls on the water molecules. I show how water can be affected by a high voltage supply and an electrostatically charged comb.

The process by which the droplet changes shape is known as electrowetting.

Cathode ray tube disassembly and explanation

I cut open a cathode ray tube (picture tube, or CRT) and explain the internal parts and their function.