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TIL China and India have been the population centers of the world for at least 6,000 years

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4kLXa TIL: During the peak of the Vietnam war the Củ Chi tunnels linked Viet Cong support bases over a distance of 250 kilometers (155 miles), from the outskirts of Saigon all the way to the Cambodian border.
EgQKd TIL It's the opposite: A frog that is in gradually heated water will jump out. While a frog placed into already boiling water will die immediately, not jump out.
dDD9K TIL that 75% of all bees are solitary and don’t form hives, and in North America, only the introduced European honey bee and bumble bees form hives.
jNLGv TIL that the British soldiers responsible for the Boston Massacre were defended by future U.S. President John Adams. At the risk of his own reputation, and even though he disliked the British, he took the case, as he believed in the right to a fair defense and trial.
p8ADA TIL that San Francisco had an outbreak of BUBONIC PLAGUE in 1900–1904 that killed 119. While city officials acted quickly to contain it, California Gov. Henry Gage covered it up to protect the powerful railroads and other businesses. Some newspapers helped by defaming the city health commissioner.