If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Doodling in Math and more
Recreational mathematics and inspirational videos by resident mathemusician Vi Hart
All content in “Doodling in Math and more”

Hexaflexagons

Since it's shaped like a hexagon and flex rhymes with hex, hexaflexagon it is!

Thanksgiving math

Mathed potatoes, Borromean onion rings, green bean matheroles and Turduckenen-duckenen (yes, you read that right)

Infinity . . .

Understanding infinity (all different kinds!). Countable and uncountable infinities. Bigger and smaller infinities.