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TIL a 4,500 yo Construction Logbook of the Great Pyramid was Found in 2013. It reports on the making and shipping of limestone blocks and the everyday life of workers.

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Y71NB TIL that Bisha’h is a lie detection ritual practiced by Bedouin tribes of Ayaidah in northeastern Egypt. It involves suspects licking a heated metal spoon in front of tribal representatives.
OoLNa TIL in the 1930s a DuPont chemist found that crystals of a substance called PTC (phenylthiocarbamide) tasted very bitter to some but were tasteless to others (about 75% taste bitterness). Researchers found three variants in a gene called TAS2R38. Two copies of this variant make you non-taster.
rRe8y TIL Colored gems (e.g. rubies and sapphires) at Tiffany & Co. are a massive ripoff because they do not clearly disclose fracture filling treatments. Infused with "colorless substances to improve color and clarity" is the difference between a $100/carat ruby and a $10000/carat ruby.
9Ar TIL the record holder for most survived lightning strikes, at 7, was struck while operating a truck, inside a ranger station, on two separate occasions after running/driving away from the storm, and immediately after the seventh strike he had to fight off a trout-stealing bear with a tree branch.
eZvn TIL the oldest known socks were intended to be worn with sandals