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TIL of Íslendingabók (the Book of Icelanders), an online geneaological database formed for anti-incest purposes and because of the fact that all native Icelanders are somehow related.

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Lk9yZ TIL prior to the 20th century, saltwater crocodiles could grow to enormous sizes of about 7 meters (23ft) in length, with a weight of 2000 kg (4400 lb), thanks to the presence of particular genes in their gene pool, which no longer exist due to extensive hunting.
XKVD TIL before refrigeration, people would drop frogs in their milk to keep it fresh. Studying this has led to finding new antibiotic substances.
1arJD TIL that not only do snowy owls nest on the ground, but that in good hunting conditions will construct a nest out of dead lemmings.
EagX TIL Volvo will pay for you to take a trip to Sweden so you can pick your new car in their Gothenburg Factory Delivery Center.
0kkN TIL that all of the six remaining William Shakespeare signatures have different spelling