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TIL blanket octopuses are immune to the sting of Portuguese man-o-wars and have been known to collect stinging tentacles from the jellyfish-like creatures and wield them like weapons to fend off predators.

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OobBg TIL of Thalidomide, a "safe" drug made by the german pharmaceutical company Grunenthal, that deformed thousands of babies around the world because it was sold as safe for pregnant women, when it was not. The company never made up for it, and today's FDA rules were created in response to this drug.
6WyY TIL water, electricity and gas has been free in Turkmenistan since 1991.
N7kWM TIL the first "smartphone" pre-dated the iPhone by 15 years.
W7vxA TIL that researchers raised a lung-bearing fish called the bichir entirely on land in order to study how its behavior and anatomy adapts, hoping to better understand the steps which led to the evolution of tetrapods
NerE TIL that when Weird Al asked Kurt Cobain if he could make a parody of “Smells Like Teen Spirit”, Cobain asked if it was about food.