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TIL that the Accessible Pedestrian Signal sound that gets pedestrians' attention the most efficiently is a "rapid tick," which sounds like a machine gun.

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g849 TIL: In 2011, the US Attorney General personally asked David Simon to create a 6th Season of HBO’s The Wire. His response? Sure – as soon as you end the war on drugs.
ZpalY TIL Crystal Cave in Mexico is so humid and warm that fluid will begin to condense in a person's lungs, and cause them to 'drown' if they linger too long inside.
6EQRX Til that the cargo hold of the Lockheed C-5 Galaxy is one foot longer than the entire length of the first powered flight by the Wright Brothers at Kitty Hawk.
9w8jr TIL that the music theme associated with the circus was originally composed by Julius Fučík as a military march.
e07QL TIL of Boustrophedon or "Ox-Turning", a method where ancient writers would write left-to-right on one line and right-to-left (mirrored) on the next line, alternating each line until the end of the writing; a method that is easier to read than what we read today.