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TIL that there wasn’t a North Star throughout much of antiquity, and after the year 2100, Polaris (the current North Star) will start moving away from the celestial north pole. There won’t be another North Star until around the year 4200.

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D6pg TIL penguins have been known to push a fellow penguin into the water to check if the area is safe and free of predators
epnAD TIL radiation exposures during the Chernobyl disaster were as high as 16 Sv (sieverts), three times the lethal LD50 dose of 4.8 Sv. A human near a breach of the ITER fusion reactor's containment vessel would be exposed to 2000 Sv every second.
oBMao TIL: The D in D-Day actually means.. day. Day-Day.
1yKP TIL in 2013 Charlie Sheen appeared on an episode of Conan and said that he had laughed so hard while watching Chappelle Show, he experienced a ruptured hernia and was rushed to the hospital. The producers of Two and a Half Men assumed his hospitalization was a drug overdose and fired him
LkWPr TIL that Saturns’ rings are, cosmically speaking, a very brief event. We are about halfway through their 200 million year lifespan and are very lucky as a species to be alive to witness them. “Some velociraptor with a telescope looking at Saturn would not have seen rings.”