How do fish swim so quickly?

Featuring Tadashi Tokieda... Get 60% off your first box from MEL Science at and use code NUMBERPHILE60 (episode sponsor) More links & stuff in full description below ↓↓↓ Tadashi Tokieda is a professor of mathematics at Stanford University, specialising in applied mathematics. More videos with Tadashi: Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. And support from The Akamai Foundation - dedicated to encouraging the next generation of technology innovators and equitable access to STEM education - NUMBERPHILE Website: Numberphile on Facebook: Numberphile tweets: