kinetic energy

How Pinewood Derbies Work

Tens of millions of Scouts, and their parents, have taken standard blocks of wood and turned them into cars that zip along at up to 20 mph. Learn about the origin, physics and more of Pinewood Derbies in this episode.

How Slinky Works

It has been called a "glorified spring", but Slinky is one of the best selling toys of all time. From accidental origins to an unlikely resurrection, Slinky has a pretty great back story.