How many panels on a soccer ball?

Alex Bellos discusses how the Incans used knots in string (Quipu) to record numbers.Check out Brilliant (get 20% off their premium service): https://brillian...

Applying the Euler Characteristic to a soccer ball (football).

See the Brussels Sprouts video: http://youtu.be/OAss481FfAQ
Truncated Icosahedron: http://youtu.be/4mEk7d8oRho
An extra bit: http://youtu.be/QwfPTE7lEbE

Featuring Teena Gerhardt, Assistant Professor at Michigan State University.