Harrison gives a mini lesson on gravity, then talks with an astronautintraining about how to prepare for zero gravity.
Harrison learns how astronauts perform everyday tasks like sleeping, showering, and getting haircuts in space.
Soft bodied invertebrates have no bones or major hard parts, which gives them some big advantages.
Many of the earth's scariest creatures are actually just trying to survive.
In this episode, prank-loving teenage Emperor Elagabalus hosts a dinner party on Roman Come Dine With Me, and some British officers try to get their heads around the complicated causes of World War I.
Take a personal and in-depth look at the first man to set foot on the moon: Neil Armstrong, one of the world's greatest and least-understood heroes.