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TIL In Africa and Asia, Panthers are black Leopards, whereas in the Americas, they are black Jaguars. Accordingly, Panthers are not actually a separate (or single) species at all, but melanistic variations of different big cats.

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Wg7X TIL the panama canal turns 100 today
ADGEg TIL a deceased man was considered a coauthor of a 1990 math paper after he appeared in a dream to the other author to explain some of the key ideas.
4kerw TIL of Law Lords. Formally known as Lords of Appeal in Ordinary, they were members of the House of Lords acting as judges for the chamber's judicial functions as it was the UK's court of last resort for over 200 years, until the creation of the UK Supreme Court in 2009.
8awA8 TIL that a Nepali doctor Sanduk Ruit has restored the eyesight of over 100000 patients across Asia and Africa
Y7MYx TIL around 20% of sperm are abnormal and may possess two heads, no heads, or two tails. Known as "kamikaze sperm", they are theorized to attack and kill the sperm of rival males with enzymes and block them from reaching the egg.