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TIL: Whistling to cat call a woman is just the whistle to recall your dog - but in reverse

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8avbV TIL The Centennial Light is the world's longest-lasting light bulb, burning since 1901. It is often cited as evidence for the existence of planned obsolescence in later-produced light bulbs.
NX6Ke TIL the original story of "Frankenstein" was written by an 18 year old runaway and mother, Mary Godwin ("Shelley" after marriage) when her pregnant stepsister's boyfriend, Lord Byron, created a contest for his friends to write the best ghost story after a cold summer night talking of gruesome things
R5Mx8 TIL Jackie Robinson served in the first black tank unit to see action in WW2, but missed deployment due to his court-martial for refusing to move to the back of a bus.
Mb50 TIL that night vision goggles are green because the human eye can differentiate more shades of green than any other color.
0wKMj TIL that in April 1831, in northern England, the combined and synchronised footsteps of a British Army unit induced mechanical resonance in a suspension bridge, which caused its collapse and many injuries. British Army practice is now that all troops must break step as they cross bridges.