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TIL a Greenland shark was tagged off Greenland in 1936 and recaptured in 1952. Its measurements suggest that Greenland sharks grow at a rate of 0.5–1 cm (0.2–0.4 in) per year, thus the largest individuals may live about 200 years, making them among the longest-lived vertebrates on Earth.

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b6eQ9 TIL that Emperor Hirohito, the leader of Japan during WW2, was an avid marine biologist credited with describing dozens of new species of crabs, starfish, sea spiders and sea squirts.
D1Rre TIL A dig in London unearthed a stylus inscribed with 'I went to Rome and all I got you was this stylus' that dates back to 70 a.d.
b9GJa TIL about a species called the pied hoverfly (Scaeva pyrastri). It has copied the appearance of a wasp but it’s white. They do this to fool their natural enemies into not eating them because wasp are poisonous. So if u ever see one, don't worry it's harmless. (See link for photo’s)
1PBW TIL A super massive star called Eta Carinae (7,500 light years from Earth) is nearing the end of its life. It could explode tomorrow or 1000 years from now in what is known as a supernova. The explosion will create a blast so violent that its flash will briefly outshine the entire Milky Way.
JYyQ4 TIL of Arthur, an street dog from Ecuador who followed a Swedish sports team during a marathon after they gave him a canned meatball. Afterwards, they adopted him and took him back to Sweden. He inspired a foundation to rescue other street dogs.