Isaac Newton · every age

What was Isaac Newton doing at 65?

Invented calculus and gravity theory in a plague year at 23

1. c. 1708

   Keill accused Leibniz of plagiarism in the Society's journal

   The calculus feud escalated.

   Source: en.wikipedia.org

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