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TIL that the first human name in recorded history is: Kushim. He signed his (or her) name at the bottom of a tablet that's over 5,000 years old, which was excavated in Sumer. Kushim signed at the bottom of the tablet to note how much barley they had on-hand.

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via reddit.com

4k9rb TIL cars at the turn of the 20th century were more aerodynamic in reverse. They learned this after Chrysler hired Orville wright to create a wind tunnel for them
nW4rY TIL Queen Elizabeth I of England wore lead-based white makeup and wigs to hide scarring from Smallpox
9wKrB TIL about the "Rabbit Test," a human pregnancy test created in 1931. It involved injecting urine from a woman into a female rabbit. If the rabbit's ovaries showed enlargement upon dissection, it indicated the woman was likely pregnant, with about a 98% certainty. This was utilized until the 1970s.
Y70kx TIL U.S. railroads adopted the Standard Time System on the "Day of Two Noons." On Nov. 18, 1883, the Univ. of Pittsburgh's observatory telegraphed railroads at the exact moment of high noon under the 90th meridian line to reset/synchronize their clocks, dissolving the 100+ timezones previously used.
16QMD TIL in 2016, an Oregon man essentially dissolved inside a hot spring at Yellowstone National Park in Wyoming after he accidentally fell into it.