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TIL it is possible to have multiple pupils or even multiple irises in one eye. The condition is called Polycoria.

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wLNEY TIL Gouda is pronounced How-da
X0gOE TIL Until 1922 you could go to jail for taking a foul ball
rRPLx TIL the man who discovered the placebo effect, Henry K. Beecher, was a medic in WW2. After running out of morphine doses for his soldiers, he gave them a saline solution which did not include an active drug. To his surprise, most patients reported pain relief, despite having severe war injuries.
9Y7oG TIL about Japan’s 5pm bell, or national emergency broadcast system, that plays music each day at a specific time for over 90% of the country. The music is actually a daily test to ensure the system can inform residents of any major disasters (i.e. tsunami, industrial accident).
d8Rvj TIL There are approximately 500,000 people on aircraft above North America at any one time.