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TIL Ted Cassidy, best known as Lurch on the original Addams Family series, was 6 feet and 9 inches tall. He died from a botched surgery to remove a tumor on his heart, which resulted from the condition acromegaly that caused his iconic voice, facial structure and height.

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9wJbm TIL that blood donation was segregated in USA, and initially excluded African-American donors. It was not until 1950 that the Red Cross stopped requiring the segregation of so-called N. blood. And it was not until the late 1960s and early 1970s that Southern states overturned similar requirements
pYGwG TIL Qatar has the world's highest gender ratio with 300 males per 100 females.
DQgrD TIL Deep-sea divers use a mix of 79% helium and 21% oxygen, making their voices squeeky. They need to use pitch control to understandably communicate.
RbE9 TIL That the side-blotched lizard uses a ‘rock-paper-scissors’ mating mechanism, with Orange throated males beating blue, blue throated beating yellow throated, and yellow beating orange.
M7OEW TIL Alaska uses military artillery guns for avalanche control