Nina investigates how hot air balloons fly - with the help of Luke, her sight neuron. Engineers Aimee, Thomas and Sydnie visit Nina in her workshop and discover that hot air rises. They go to a hot air balloon festival and find out that if there's enough hot air a balloon can lift all of them up.

Originally released by BBC Worldwide Learning, 2013. Streaming video file encoded with permission for digital streaming by Infobase on April 29, 2015.