Experimenters Chloe and Grace visit Nina in her workshop and discover what makes triangles a really strong shape. Next, they go to the Eiffel Tower in Paris to find out how you can make squares stronger. Finally, they do an experiment that explains why the Eiffel Tower was built with lots of triangles.

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

Meet the Neurons (0:55); --Why Do We See So Many Triangles in Buildings? (2:33); -- Senses Experiment (2:29); -- Can Squares be Made Stronger? (3:18); -- Which Triangle Tower is Stronger? (2:23); -- Summary: Why Do We See So Many Triangles in Buildings? (0:38); -- Credits: Triangles—Nina & the Neurons: Get Building (1:56);.