› added 2 years ago

125

TIL of "oxygen candles", which release oxygen when burned. They are used as an emergency supply of oxygen in submarines, airplanes, and the space station.

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MVl0 TIL that there was a 15mi long island that was charted on maps since 1774, only to discover in 2012 that it never existed in the first place.
kOyJE TIL that due to the fact that they spend the majority of their lives on sea ice, polar bears are classified as marine mammals, like dolphins, seals, and whales.
E1bpW TIL about Project Retro, an idea proposed by the US Air Force around the 1960's that called for a thousand rocket engines to be strapped to the equator of Earth which would allow the US to slow/stop the rotation of the planet in an effort to "dodge" Soviet ICBMs.
8a1nV TIL the louder your environment, the less flavor and texture your food has
YpGMG TIL: From AD 755-766, the An Lushan Rebellion consumed the Tang Dynasty in China. Modern estimates suggest ~13 million died (5% of the world's population at the time) from the conflict and subsequent societal collapse