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TIL Pierre-Simon Laplace's nebular hypothesis from 1796 is still, with some modification, the prevailing hypothesis for the origin of stars and planetary systems. Laplace proposed that nebulae are future solar systems, waiting to happen

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9BMM TIL in the Ecuadorian Rain Forest trees have been discovered that can “walk” up to 20 meters in a year
NJ0b TIL that beer hops contain a naturally-occurring acid that can kill varroa mites, a parasite killing off honey bee colonies.
VBJYB TIL that there is a difference between a heart attack and a cardiac arrest! And if you attempt to use a defibrillator on a heart attack victim, you may actually kill them!
JY0VQ TIL that suppressing your emotions is physically unhealthy, greatly increasing your risk of premature death and cancer. So cry, scream, let it out. You'll thank yourself eventually.
4Vj5 TIL that a guy, before he blew his brains with a revolver on the steps of Harvard Memorial Church in front of a tour group of 30 people, he wrote a 1,905-page suicide note and emailed it to over 400 people. Some view it as a masterpiece of modern philosophy.