We just learned about the Nell Rocket by Robert Goddard.
Another part of rocket science is the de Laval Nozzle.
When Robert Goddard was working on his rockets, he decided to use a type of nozzle that would have a pinch in the middle.
The smaller part of the nozzle puts pressure on the burning fuel, and it comes out at a supersonic speed, burning faster than the speed of sound.
The De Laval Nozzle was actually invented by a German engineer who came up with it for steam engines.
(from: wikipedia - de laval nozzle)
Kid Facts - Blast from the past: Supershear Earthquake
