Charles Darwin · every age

What was Charles Darwin doing at 28?

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

1. Jul 1837

   Opened his first notebook on the transmutation of species

   In it he sketched a branching tree of life.

   Source: en.wikipedia.org

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