Adam Gemili tries outrunning a Red Arrow. Rachel risks her life passing through a wall of fire. Ben uses Joey Essex's brain power to drive a car. Romesh, a former teacher, returns to the classroom armed with a new piece of technology.

Romesh hopes that a fridge won't hit him on the head. Ben and Eamonn Holmes uncover the explosive powers of sugar. Rachel finds out what life is like for British astronaut Tim Peake.