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TIL Scientists can use a person's own stem cells to make male eggs and female sperm. They have also successfully fertilized a male mouse with an egg cell made of its own cells, producing healthy offspring only from a single mouse's genome. So far, this has not been tested with humans.

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pYowN TIL that whales and dolphins are closely related to hippopotamuses, sharing a common ancestor from around 55 million years ago. Despite living in water, whales evolved from land-dwelling mammals
p8vme TIL that when someone set Cleverbot up talking to itself, it (they?) almost immediately started talking about God
9YdXr TIL of Syndrome K: a fake disease that Italian doctors made up to save Jews who had fled to their hospital seeking protection from the Nazis. Syndrome K "patients" were quarantined and the Nazis were told that it was a deadly, disfiguring, and highly contagious illness. They saved at least 20 lives.
JYGQv TIL the subject of "Christina's World," one of the best-known American paintings of the middle 20th century, was Anna Christina Olson. The artist was inspired after observing her crawling across a field, which was due to her medical conditions- Charcot–Marie–Tooth disease, a genetic polyneuropathy.
5nw8 TIL that a group of Nuns is called a Superfluity, Cobblers a Drunkenship, and (wild) Cats a Destruction. Here is a huge list of Collective Nouns.