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101

TIL that oxygen (together with iron) account for most of the mass of planet earth

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W7WQX TIL the first western alchemist was a woman named Mary the Prophetess
e0RLE TIL the Catholic Church has accepted the Big Bang theory and Darwinian evolution since 1950.
d8AQE TIL of the speed camera lottery in Stockholm, Sweden. Drive at or under the speed limit and you'll be entered into a lottery where the prize fund comes from the fines that speeders pay. Average speed reduced from 32km/h to 25km/h (a reduction of 22%)
p8AY8 TIL about the largest known structure in the observable universe - Hercules–Corona Borealis Great Wall. It's approximately 10 billion light years in length, more than double the previous record holder, or 9.3% of the observable universe's diameter.
OGX7 TIL the nonsense song that Rafiki sings to Simba in The Lion King is actually a common Swahili children’s song