Crash Course History of Science - Season 1 Episode 31

Hannah Fry takes a spectacular look at the science of size by imagining a parallel world in which everything is made bigger or smaller.

Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.

This ground-breaking two-part series takes us inside two of the most amazing structures in the natural world: our hands and feet.

Dr Helen Czerski examines the world of sound waves.

Chris Jackson, Xand Van Tulleken and Aldo Kane take part in an extraordinary expedition to one of the world's most dangerous, spectacular and least...