https://github.com/davepinch/pinchy.cc/blob/master/content/streams/the-world-made-of-dust/sometimes-in-the-darkness/2/i-learned-the-shape-of-a-skull.md
Planck was born in 1858 in Kiel, Holstein (now Schleswig-Holstein), to Johann Julius Wilhelm Planck and his second wife, Emma Patzig.