Charles Darwin · every age

What was Charles Darwin doing at 47?

Boarded the Beagle at 22, published his big idea at 50

1. c. 1856

   Began writing his big book on species, at Lyell's urging

   Lyell warned that someone else might publish first.

   Source: en.wikipedia.org

Portrait: Photo: Maull & Fox (c. 1854), public domain, via Wikimedia Commons · source