Why is the sky blue?

A physics lecture for non-physicists. 
Title: Why is the sky blue?
Speaker: Yasha Neiman.

The sky is blue because position and velocity are relative, and only acceleration is real.

Also features:
1. Discovering the speed of light by playing with capacitors and coils.
2. Why do all the different stars shine in the visible spectrum? How can the Sun have a surface temperature, if it has no surface?