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TIL about Kerogen, a solid, insoluble organic matter found in the sedimentary rocks. When continually heated, it leads to the slow release of fossil fuels such as oil and natural gas.

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BryOe TIL George Washington died from cynanche trachealis, aka the croup, mainly due to over zealous Doctors. Washington feeling very sick asked his overseer, Albin Rawlins, to bleed him. Doctors bled him four more times over the next eight hours, with a total blood loss of 40% along with other remedies.
mxYeE TIL when Les Miserables was published in England, Hugo telegraphed his English publishers a one-character query: "?". They replied: "!".
V4ZZ TIL The only known armed Nazi military operation on North American soil, in October of 1943, was installation of Weather Station Kurt by a German u-boat team. It was accidentally discovered in 1977.
PLxO TIL that the Boston Marathon (2013), Virginia Tech Shootings (2007), Columbine Shootings (1999), Oklahoma City bombing (1995), and the Branch Davidian siege (1993) have all occurred in the same week of April.
kXRW TIL that the Honeyguide bird can guide African tribes to beehives after exchanging whistles with them. Once the humans have removed the honey, the bird can feed on the remaining beeswax and larvae