Nina investigates why people have a brain with the help of her five sense neurons. Experimenters Chevaz, Kian and Shay visit Nina in her lab and discover that the amazing brain is the control centre for the body - in fact, the bossy brain tells the body what to do! A game with some remote-control cars helps them to find out more. Nina explains that the remote controls are sending invisible messages to the cars, telling them to move. And the brain controls the body by sending invisible messages too. These messages are delivered by something called motor neurons. But the body can send messages back to our brain too, using sense neurons. A final experiment with a giant digger, a big pile of sand and some walkie-talkies explains how this works.

Streaming video file encoded with permission for digital streaming by Infobase on October 01, 2015.

Meet the Neurons --(0:57) -- Why Do We Have a Brain? -- (2:31) -- Senses Experiment -- (3:16) -- Motor Neurons -- (2:13) -- Sense Neurons -- (2:59) -- Summary: Why Do We Have a Brain? -- (0:35) -- Credits: Brain-Nina and the Neurons: Brilliant Bodies -- (1:53).