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TIL: Some tarantulas will keep frogs as “pets” to protect their eggs from insects.

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x67rB TIL Xiongnu emperor Helian Bobo set up extreme limits for his workers. If an arrow could penetrate armor, the armorer would be killed; if it could not, the arrowmaker would be killed. When he was building a fortress, if a wedge was able to be driven an inch into a wall, the wallmaker would be killed
J1vaQ TIL Lightning can heat the air it passes through to 50,000 degrees Fahrenheit (5 times hotter than the surface of the sun)
5YYpQ The most dangerous pollutant might not even be known yet.
Wkjl4 TIL of Jennifer Strange, who died after drinking nearly 7.6 litres (2 gallons) of water over 3 hours for a "Hold Your Wee for a Wii" radio contest.
YpMB7 TIL that when Freud left Austria, he was required to sign a document testifying that he had had every opportunity 'to live and work in full freedom' and had 'not the slightest reason for any complaint'. He signed it, adding a remark of his own: 'I can most highly recommend the Gestapo to anyone.'