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TIL The bottom of Lake Ontario is so cold that skyscrapers use it as coolant for AC systems

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e0Jak TIL that, unlike adult cataracts, which can be removed after years and normal eyesight is restored, severe pediatric cataracts must be treated within weeks or the brain will learn to permanently ignore the defective eye.
lo4a TiL The most common ingredient in bacterial soap is triclosan. It is never completely removed during water treatment and when it arrives at the ocean it is toxic to marine life.
1ayAW TIL of the oldest human structure. Predating Mesopotamian civilization and Stonehenge by 6,000 years, Gobekli Tepe. Researchers determined a pillar (pillar 43) depicts a comet colliding with Earth over 10,000 years ago causing a millennia of global cooling.
Lk9GQ TIL of the Emery Celtic Cross - in the early 2000s, a Forester in Ireland planted two different species of trees to create a 125 metre tall Celtic cross design within a forest. The design was first discovered in 2016 by an airplane passenger, 6 years after the Forester, Liam Emery, had died.
Oop01 TIL The latitude coordinates of the Great Pyramid of Giza match the value of the speed of light to seven decimal places.