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TIL that after the Empire State Building opened in New York City in 1931, much of its office space went unrented. It was nicknamed the “Empty State Building” by New Yorkers and didn’t become profitable until 1950.

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QJjQp TIL that genetical variation within human population is far less diverse than other species of mammal.There is no reason to assume that major genetic discontinuities exist between peoples on different continents or "races."
e0DKE TIL there was once a LEGO game in devolpement that would allow people to make anything they wanted out of Lego bricks, but it was never completed because they couldn’t stop people making dicks, even with a dedicated ‘dong detection’ team.
Bg0Er TIL thousands of "low head dams" (aka "killer dams" or "drowning machines") were built on US waterways in 1800s, are nearly invisible from upstream, have killed hundreds of people, often serve no modern purpose, and for all that, are largely unregulated
nWBGb TIL that the first heartbeat in zebrafish embryos begins abruptly and in sync across all heart cells, a process likened to an army starting to march in perfect unison without prior practice.
XEJBP TIL in 1994 in Zimbabwe over 60 school children saw a disc shaped craft descend on the school grounds with beings coming out of it and the kids who are now adults still claim it's not a hoax