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TIL there is a proposed punctuation mark for irony and sarcasm, but due to lack of adoption it remains unused

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LbR0 TIL that a solid 8 hour sleep is actually unnatural to us as a species. A 4 hour sleep, waking for 1-2 hours, followed by another 4 hour sleep is how we slept for the majority of evolution. The change to a solid 8 hour sleep was originally attributed to improvements in lighting and other things.
jQ5Q TIL an amendment to the U.S. Constitution was proposed to change the country’s name to “the United States of Earth.” It did not pass.
WPxo TIL The first modern Olympic Marathon was won by a Greek who stopped at a bar mid-race for a glass of wine
vPa1R TIL of the Niland brothers, four brothers from New York who fought in World War II. Two died in combat, one survived, and one was believed to be dead but actually survived the war and was held in a Japanese POW Camp in Burma. Their story served as the inspiration for Saving Private Ryan.
PlmJ TIL Tylenol(paracetamol) also reduces pain from social rejection(i.e. emotional pain).