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TIL the diffusion of responsibility is the phenomenon where individuals in a group are less likely to take action or feel responsible, assuming others will do so. This often leads to inaction in situations where help is needed.

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PYovg TIL that when emperor Hui of Jin ( 259-307) was informed that his people were starving from a rice famine, he replied with the famous chinese version of let them eat cake: "why don't they eat meat porridge?"
j6K5M TIL that in 1917, when the US Army tested what later became known as the M1917 Browning Machine Gun, it was able to fire non-stop for 48 minutes and 12 seconds (over 21,000 rounds) without a malfunction. It went into service in late WWI, and is still used by some irregular forces today.
rNWQW TIL that same-sex behavior has been recorded in more than 1000 species in animal kingdom ranging from beetles to penguins.This was earlier often seen as an example of Darwin's paradox as these behaviors are non-reproductive and don't contribute to the advancement of species in the traditional sense.
WkyVN TIL that cows were used for radiation testing of early cell phones. Farmers were paid to have high-powered phones strapped to their cows head 24/7. A single engineer worked full time to chase the cows and change the batteries.
mxngo TIL Mike Tyson's Training Regiment included waking up at 4am, jogging 5-miles. Then he would do 2000 sit-ups, 500 pushups, 500 dips, 500 shrugs and about 30 minutes of neck bridges daily. He repeated this 6 days a week.