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TIL Bipolar disorder may have been a climatic adaptation for humans to survive short summers (manic episodes for high productivity) and long winters (depression to slow metabolism).

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OlO6 TIL Our galaxy probably contains at least 2 billion planets like Earth.
kO96g TIL the first four Dr. Seuss books were called Boners, More Boners, Still More Boners, and Prize Boners of 1932
e0KP6 TIL an article in 1968 revealed widespread marijuana use among US soldiers in Vietnam. As a result of the media uproar stateside and subsequent crackdown by the army, soldiers shifted to heroin, which was odorless and harder to detect. By 1973, up to 20% of the soldiers were habitual heroin users.
AVol TIL The U.S. hasn’t been hit by a major hurricane since 2005, the longest ‘hurricane drought’ in recorded history
W5eY TIL Saudi Arabia is the largest country in the world without a river.