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TIL that Laughing lowers levels of stress hormones and strengthens the immune system. Six-year-olds laugh an average of 300 times a day. Adults only laugh 15 to 100 times a day.

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oB1Ao TIL that there was a blind bisexual goose who fell in love with two swans and helped raise 60+ of their babies
b9gyj TIL When a patient is zapped with a defibrillator, their heart stops beating altogether - the two electric paddles attached to the patient's chest essentially 'reset' the heartbeat. Once the heartbeat stops, the heart starts afresh and begins beating normally again.
VB7dp TIL the $327.6 million Mars Climate Orbiter was lost in 1999 due to a unit conversion error. NASA's team used metric units, while Lockheed Martin used Imperial units for calculations, causing the spacecraft to enter Mars' atmosphere too low and burn up.
LNN9 TIL That whales milk is similar in constancy as toothpaste; it must be thick, or else it will dissipate into the surrounding water.
4X7a6 TIL that a mummified arm hangs on the wall of a church in Prague. While attempting to steal some jewels from the church, a thief became stuck and his arm had to be amputated. The arm, which is about 400 years old, was hung from a meat hook as a warning and it's been there ever since.