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TIL that over 60% of global iron reserves and most of the iron ore currently mined were created by precambrian bacteria. These cyanobacteria caused the Great Oxygenation Event, where free oxygen became much more common on Earth. Some of this oxygen combined with iron to form banded iron formations.

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4kDQJ TIL that there will be no Hanukkah in the year 3031, but two Hanukkahs in 3032. This is due to the overlap between the Jewish and Gregorian calendars, as well as the leap month added to the Jewish calendar.
xxD0 TIL there is a unique career known as a ‘Professional Fan’ and only belongs to one person. His name is Cameron Hughes and he gets paid by sports teams to cheer at their games.
dlPQ TIL in 2009, Russian Cosmonauts on the International Space Station were banned by their officials from using the ‘luxurious’ U.S. model astro-loo toilet, and were only allowed to use the Russian-built toilet.
LQYdp TIL of the swing riots in 1830 England. Farmers unemployed by new machinery rioted across much of England, which prompted calls for reform. The PM, the Duke of Wellington, suggested the existing constitution was perfect and couldn't imagine reform causing a mob to attack his house and his fall as PM
RkvQ TIL Hungarian chemist George de Hevesy dissolved the gold Nobel Prizes of German physicists Max von Laue (1914) and James Franck (1925) to prevent the Nazis from confiscating them. After the war the gold was re-cast into medals and again presented to Laue and Franck.