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TIL Dancing mania was a social phenomenon that occurred primarily in mainland Europe between the 14th and 17th centuries. It involved groups of people dancing erratically, sometimes thousands at a time until they broke their ribs and subsequently died.

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xVLrb TIL about Pedro Rodrigues Filho, the killer who only targetted at criminals and those had wronged him. He was sentenced 126 years imprisonment, but since he kept killing criminals during his time in prison, his sentences was raised to 400 years.
n5EG TIL that researchers estimate that the Internet consumes less than 2% of the total energy consumed by humanity (as of 2011)
mxblM TIL the "old woman" from Metallica's song "The Memory Remains", Marianne Faithfull, was only 50 at the time of recording and is still alive.
neex9 TIL Ladybugs can bite. They have mandibles and their bites will pinch/sting and often result in a raised red bump that may hurt for a few days.
pYKNb TIL that execution by electric chair, first tested on calves and a horse, was so badly botched on its first human in 1890 that a second 2,000‑volt jolt reportedly set him on fire. The generator’s supplier said “They would have done better using an axe,” and the NYT called it “Far worse than hanging.