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80

TIL that the very first Lego bricks did not lock together.

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Bgn1L TIL in 1992-93, four children died and hundreds of people were sickened by an E.Coli outbreak linked to undercooked beef at the Jack In the Box fast food chain.
9YjMr TIL Time Team was the biggest funder of archaeological digs in the United Kingdom. The TV show also produced more research papers than any other archaeology group or university in the country. The show is credited for increasing the number of people interested in archaeology.
Oonr6 TIL a number is divisible by 3 if the sum of the digits is divisible by 3. We know the number 627, for instance, is divisible by 3 because 6+2+7=15, which is divisible by 3.
Y7R0x TIL Ants sleep for 5 hours a day in short 1-2 minute naps with their longest being around 10.
grOEy TIL The Hale telescope features a 200 inch (5.08m) diameter mirror. The mirror took 10 months anneal and was delivered to Caltech in 1936. The telescope was completed in 1948 as it took years of grinding and polishing to make the mirror accurate to 2/1,000,000ths of an inch of a perfect paraboloid.