Experimenters Arnav and Ayomide visit Nina in her workshop and discover how sound travels. Next, they visit a real amphitheatre in Lyon in France to find out what happens to sound when it hits a hard surface. Finally, they do an experiment that explains what amphitheatres do to make sound travel all the way to the back.

Originally released by BBC, 2015. Streaming video file encoded with permission for digital streaming by Infobase on January 17, 2017.

Meet the Neurons (0:56); --What is an Amphitheater? (1:50); -- Senses Experiment (3:34); -- Hard Surfaces (2:37); -- Designing an Amphitheater for Sound (2:36); -- Summary: What is an Amphitheater? (0:41); -- Credits: Amphitheatres—Nina & the Neurons: Get Building (1:59); .