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TIL in 1992, about 70 youth members of the Eclaireurs de France, a French scouting association, descended on the Cave of Mayrières supérieure with steel brushes to clean up graffiti, erasing two 15,000-year-old cave paintings of bison before realizing what they were.

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nW7ZP TIL the word tsunami actually means "harbor wave" because the ancient Japanese fishermen did not notice the shock wave passing them while they were out at sea because the wave does not unleash its destructive energy until it reaches shallow waters.
RWva TIL most of the Islamic world mourned and condemned the 9-11 attacks, including Turkey half-masting all flags and Iran holding candlelight vigils.
yAKV TIL that Mark Zuckerberg made so much money in 2013 that his pay raised the average compensation for a tech worker in San Mateo county by $80,000, from $210,000 to $290,000.
oBmbo TIL about the "Flynn Effect" which shows the average IQ is rising steadily each generation. IQ tests are continually made harder to keep the average at 100. Today's children that take tests from past decades are averaging significantly higher than 100.
4dea TIL David Kirwan, 24 from California, jumped into a hot spring, typically measured at 200°F (93°C) at Yellowstone after his dog escaped the truck and ran into the Celestine Pool, yelping. Several people tried to warn Kirwan off by yelling at him not to jump in, but he shouted “Like hell I won’t!”