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TIL about "doubling"—a method of multiplication devised by the ancient Egyptians that required only the abilities to multiply and divide by 2 and to add. This method is still in wide use today as implemented by binary multiplier circuits in modern computer processors.

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b6MN4 TIL learned that in 2003, Virginia Tech built a 'self-made' super computer (ranked #3 on the Nov 2003 TOP500 list) by using 1,100 Apple Power Mac G5 computers. It was named System X, from the Max OS X operating system.
loLeV TIL bar-tailed godwits, a type of bird, breed in Alaska, and then migrate south for the winter - they fly to New Zealand in one non-stop trip which can take up to 9 days, not even stopping to feed. The round-trip migration for this subspecies is over 29,000 km.
loEK7 TIL the spiked tail of a stegosaurus is called a ‘Thagomizer’ after a joke in a 1982 Far Side comic.
WlMo TIL: There is a residential area in Stockholm, Sweden just north of the Stockholm University that has a tradition whereby at 10 PM every Tuesday the residents open their windows and scream for several minutes to relieve stress caused by university exams.
OvV7 TIL that in July 1945, Kodak accidentally discovered the U.S. was testing atomic bombs after customers complained of “foggy” film.