The doctors reveal how the human brain creates maps to prevent getting lost.

3, 2, 1 blast off! Dr Chris and Dr Xand explore what happens to the human body in space, tackling the big body questions on everyone's lips - what happens to your snot when you sneeze, do you really get taller, and how do you poo and wee in zero gravity? Find out as Dr Chris boards an unusual flight to experience being weightless, and Dr Xand meets a real astronaut. Plus discover the amazing exercise machine that will change lives for astronauts and people on earth alike.