Marie Curie · every age

What was Marie Curie doing at 31?

The only person with Nobels in two different sciences

1. Dec 1898

   Discovered radium

   Over the next four years she boiled tons of ore in a shed to isolate a tenth of a gram.

   Source: en.wikipedia.org

Portrait: Photo: Henri Manuel (c. 1920), public domain, via Wikimedia Commons · source