The latest Google doodle celebrates the life of physicist and mathematician Leonard Euler, who was born 306 years ago today in Basel, Switzerland.

Euler is most famous for discovering what is now known as the Euler characteristic, a number that describes a topological space’s shape or structure regardless of the way it is bent. You might even remember Euler’s theorem (V − E + F = 2) from your algebra or geometry class. The formula appears on his Goggle doodle.

The prodigy — Euler already had a Master of Philosophy degree by age 16 — also has an asteroid named after him and has been commemorated on currency and stamps in his native Switzerland.

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