Isaac Newton · every age

What was Isaac Newton doing at 21?

Invented calculus and gravity theory in a plague year at 23

1. c. 1664

   Won a Trinity scholarship and stopped working as a valet

   It paid his way for four more years. His work on fluxions, the calculus, began the same year.

   Source: en.wikipedia.org

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