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TIL scientists determine a blue whale's age by counting the layers of it's earwax.

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4XRoa TIL the Revenue generated from the success of Pink Floyd's "Dark Side of the Moon" helped fund the production of Monty Python and the Holy Grail
P1A4e TIL Many Vikings were fearsome warriors, but most were farmers, fishermen, craftsmen and traders. Viking trading centers and trade routes would bring tremendous wealth. The Viking economy and trade network also effectively helped rebuild the European economy after the fall of the Roman Empire.
0wyLp TIL To defend against predatory wasps, honeybees create a defense wave known as shimmering. Participating honeybees need to respond with perfect timing when it's their turn to shimmer.
xrKw TIL that the 1950 toy lab set “Gilbert U-238 Atomic Energy Laboratory” contained uranium ore, polonium, a Geiger counter and a cloud chamber.
pYRwp TIL: Time spent in outdoor activities in relation to myopia prevention and control: a meta‐analysis and systematic review (Outdoor time is considered to reduce the risk of developing myopia. )