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TIL that the first succesful production to ever mix sound, color and motion on screen was an eight hour religious film called The Photo-Drama of Creation made by Jehovah's whitnesses.

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5YgaP TIL Submarine K-219, a nuclear submarine that sank in 1986 due to a missile silo leak. It sank in 18,000ft of water, and when located 2 years later, it's missile doors had been forced open and the nuclear missiles it carried were missing.
16nmO TIL that slime molds have shown an ability to learn and predict periodic unfavorable conditions in laboratory experiments
V7lm TIL that during WWI the British built a submarine armed with the gun of a battleship
Lkymv TIL Heart cancer is not as common as other kinds of cancer because heart cells do not often undergo cell division, which reduces the chances of mutations that might ultimately lead to cancer.
m1XEP TIL the exercise paradox: hunter-gatherers who trek miles daily (or climb up trees) burn the same calories as much-less-active office workers and machine operators