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TIL The parasitic flatworms released by freshwater snails kill up to 200,000 people a year. Only two other animals kill more humans than the flukes released by freshwater snails - humans and mosquitos.

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VMJk0 TIL that Karl Marx wasn't aware of advances being made in differential calculus and developed the concepts himself while writing his mathematical manuscripts
VBA6Z TIL that the construction of the Sydney Opera House was a complete failure. Exceeding the budget by 1400% and using 3 times longer. (7M and 4 years)
01y5 TIL while vacationing on a beach in Thailand, a 10 year old girl recognized the signs of a tsunami after learning about them in geology class two weeks prior. Hundreds of beach-goers were evacuated minutes before the devastating tsunami from the 2004 Indian Ocean Earthquake arrived.
Y791B TIL the Summer Olympic Games featured fine arts competitions from 1912 until 1948. Artists could compete in the categories of architecture, painting, sculpture, literature and music.
b9BaQ TIL that there exists a photograph of a baby with his mother, grandmother, great-grandmother, great-great-grandmother, and great-great-great-grandmother.