While reading Wikipedia's account of the life and work of Max Planck, a German physicist and founder of quantum theory, I came across this curious piece of information:
The same husband; the identical sisters; their identical deaths; their identical daughters. Planck must have hated his son-in-law. The man was nothing but bad luck to the Plancks.
In March 1887 Planck married Marie Merck (1861-1909), sister of a school fellow, and moved with her into a sublet apartment in Kiel. They had four children: Karl (1888-1916), the twins Emma (1889-1919) and Grete (1889-1917), and Erwin (1893-1945)......During the First World War Planck's second son Erwin was taken prisoner by the French in 1914, while his oldest son Karl was killed in action at Verdun. Grete died in 1917 while giving birth to her first child. Her sister died the same way two years later, after having married Grete's widower. Both granddaughters survived and were named after their mothers. Planck endured these losses stoically.
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