Isaac Newton · every age

What was Isaac Newton doing at 36?

Invented calculus and gravity theory in a plague year at 23

1. c. 1679

   Hooke's letters pushed him to prove orbits are ellipses

   He showed an inverse-square force produces Kepler's elliptical paths.

   Source: en.wikipedia.org

Portrait: Portrait: Godfrey Kneller (1689), public domain, via Wikimedia Commons · source