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Hot enough to boil oceans and vaporize rock. The highest terrestrial temperatures occurred more than four billion years ago, when a Mars-size proto-planet smashed into the Earth. (The debris from this collision formed our moon.) Within a millennium, the surface air temperature had dropped from a high of about 3,700°F down to 3,000°. Then the planet went into a period of slower cooling that lasted a few tens of millions of years.

E1lNo TIL The neon lights above Gordon Ramsey Steakhouse in Las Vegas are actual recorded hand movements of Gordon Ramsey making his signature dish Beef Wellington
J1Q4j TIL Eric Idle of Monty Python responded to physicst Brian Cox's criticism of his "Galaxy song" by creating a sketch where Cox gets run over by Stephen Hawking
d85rQ TIL Richard Kuhn was awarded the Nobel Prize in Chemistry in 1938 "for his work on carotenoids and vitamins". Kuhn collaborated with high-ranking Nazi officials, denounced Jewish co-workers in 1936, and is no longer considered a suitable role model by the Society of German Chemists
P1XRJ TIL California once had the largest freshwater lake in the Western USA, Lake Tulare, which at its peak stretched from modern Fresno to Bakersfield. It was ultimately drained as the rivers feeding it were diverted for agriculture in the 19th and 20th century.
61vm TIL that the flag of Nova Scotia was only officially adopted in 2013, even after 155 years of use, when an 11 year-old girl researching a project realized that it had never been officially recognized in all that time.