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TIL There are four primary chemicals that can drive the positive emotions you feel throughout the day: dopamine, oxytocin, serotonin, and endorphins (sometimes referred to as D.O.S.E.). Oxytocin specifically comes from physical contact and gives you a lasting feeling of love and security.

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GYgZ7 TIL NASA's Phoenix Mars Lander has detected snow falling from Martian clouds.
9rgG TIL that 8 people were killed in what became known as the London Beer Flood after 1,470,000 L of beer burst out of brewery and gushed into the streets; 200 years ago today on October 17 1814
X0EDj TIL that Tibetans underwent the fastest genetic change ever observed in humans. Biologists found 30+ genes with DNA mutations more prevalent in Tibetans than their predecessors, the Han Chinese, half of which help the body regulate oxygen use. They even have a "super-athlete gene" called EPAS1.
P7Bg TIL that many ancient Egyptian Pharaohs were overweight and unhealthy, in contrast to their typical depiction. That was likely due to a sugary diet of alcohol, bread and honey.
4QaJ TIL Holy Roman Emperor Frederick II (1194-1250) tried to discover a “natural language” of humans by having children raised without exposure to language. Allegedly, he never learned the answer because they all died.