Nina and Olli investigate how coal is made.

Originally released by BBC, 2013. Streaming video file encoded with permission for digital streaming by Infobase on November 17, 2016.

Meet the Neurons (0:56); --Where Does Coal Come From? (2:14); -- Senses Experiment (4:22); -- Finding Coal Underground (4:13); -- Summary: Where Does Coal Come From? (0:36); -- Credits: Coal—Nina & the Neurons: Earth Explorers (1:33); .