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Scientist Nina and her young experimenters investigate the human body. Experimenters Megan, Thomas and Zara visit Nina in her lab and learn all about eyeballs.

Nina investigates how eyes let people see, with the help of Luke, her sight neuron. Experimenters Megan, Thomas and Zara visit Nina in her lab and discover that round eyeballs are brilliant at rolling around. This means that people can look in lots of different directions without moving their heads.

They visit a theatre and find out that eyes need light to see. The light enters the eye through the little black circle called the pupil, and the coloured part of the eye - the iris - opens and closes to let more light into the eye when it is darker, and less light in when it is bright.

Back at the lab, they play a game of catch and discover that having two eyes helps people to work out how near or far away something is.

First shown: 4:45pm 18 Oct 2011
Available for 24 days Duration 15 mins