Albert Einstein · every age

What was Albert Einstein doing at 28?

A patent clerk who upended physics at 26

1. c. 1907

   First paper on acceleration under relativity, at 28

   The start of the eight-year road to general relativity. He also modelled solids as lattices of oscillators.

   Source: en.wikipedia.org

Portrait: Photo: Orren Jack Turner (1947), public domain, via Wikimedia Commons · source