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TIL the Megatherium or giant Sloth was the largest bipedal mammal in the history of the earth

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j6XrX TIL a Nilometer was a structure for measuring the Nile River's clarity and water level during the annual flood season
LrkQ TIL that some wolf handlers will not enter captive wolf enclosures if they have a cold or other vulnerability because the wolves can smell it and are more likely to attack.
vMDD TIL the pilot episode of LOST was so expensive (~$14 million) that the network president was fired for green-lighting it
Wk9WL TIL: When roosters open their beaks fully, their external auditory canals completely closed off. Basically, roosters have built in earplugs. This helps prevent them from damaging their hearing when they crow.
ZJ0D TIL that Metallica is the first and only band to play live shows on all seven continents, including Antarctica.