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TIL that the decibel scale is logarithmic. Sound at 100dB is 100x the physical intensity of sound at 80dB (the ceiling of sound volume without hearing loss), which is why small increases in dB causes such rapid hearing damage.

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mxWXY TIL about Ussuri dholes which are rare, carnivorous canids native to wilderness areas ranging from the Indian subcontinent to northeast Asia. Also called Indian dholes, these endangered mammals are known to feed on herbivores such chitals, sambars, and gaurs, and occasionally on onagers and kiangs.
wLYNP TIL after he ‘killed’ Sherlock in The Final Problem (1893), readers got upset and relentlessly pressured Conan Doyle to resurrect the character. In 1901 Doyle released The Hound of the Baskervilles in a bid to pacify, and finally in 1903 he resurrected Holmes in the The Adventure of the Empty House.
R7nXw TIL Chimpanzees have got all the cognitive abilities necessary for the human-only practice of cooking. They understand that cooking is a process - that food is transformed into a tastier form; they don’t do it in the wild because they’ve never learned to manage fire.
j6PQM TIL Driving for long periods of time or being stuck in traffic with your foot pressed on the brake pedal of your car can cause "driver's foot" condition
gMam8 TIL the mathematician Paul Erdős regularly used amphetamines to increase his mathematical output. His friend bet him he couldn't stop using them for a month - Erdős won the bet but claimed that it had caused mathematics to be set back by a month.