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TIL about "Operation Cat Drop" in 1959, where the British Royal Air Force airdropped cats into Borneo to control a rat infestation.

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0ww1j TIL that Roman concrete, subject to marine corrosion, has stood for over 2000 years, while modern cement can break down in as few as 50 years. The concrete the Romans used contained volcanic ash and got stronger over time: the ash was slowly replaced with Al-tobermorite, a rare hydrothermal mineral.
Y76Vv TIL The song "Happy Days Are Here Again" was recorded on the same day that the stock market crashed in 1929.
w1KM TIL during the 2004 Indian Ocean earthquake and tsunami on 26 December 2004, fishermen said they saw with their own eyes “the reality of generations of legends … the remains of ancient temples and hundreds of refrigerator-sized blocks, all briefly exposed before the sea swallowed them up again.”
6Ew8m Today I Learned that Roman doctors used to drink their patients urine in order to diagnose disease, such as diabetes.
loWGA TIL: Mavis Beacon is not a real person