Inventions That Shook the World
The 1920s
S1 E3:
Mobsters, jazz, and turbulent economic times mark the 1920s. Silent film makes the transition to the talkies as sound comes to the silver screen. Criminals find that there's one less place to hide with the invention of the lie detector. And, the Space Age is launched when a rocketeer who refuses to give up finally unlocks the secret of liquid fuel.