Leonhard Euler was one of the greatest mathematicians of all time, you’ve probably never heard of.

He contributed heavily to graph theory, calculus, mathematical functions, mechanics, astronomy, and even music theory.

This guy is the reason we learn about Euler’s number “e” in math class.

Even when he almost completely lost his eyesight, he relied on his exceptional memory and mental skills to continue working.

His works, when compiled together, came to 92 complete volumes, more than anybody in history.

One day when he was 76, he was sitting at his home in St. Petersburg watching his grandson play and smoking his pipe when a massive brain hemorrhage came.

Without hesitation, he muttered, “I am dying……”, and collapsed for good.

A sad but emphatic ending to a legendary contributor to world progress.