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TIL before the Large Hadron Collider (LHC) was completely constructed, there were concerns among the public that its high-energy experiments would lead to the formation of micro black holes or strangelets, a dark-matter-like particle that can convert all matter it touches into strange matter.

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6E9ll if the Sun were 'shut off', Earth's surface temperature would drop by a factor of two about every two months. The current mean temperature of the Earth's surface is about 27 °C / 81 °F. This means in two months the temperature would drop to -123 °C / -190 °F, and -189 °C / -324 °F in four months. So basically except some bacteria seem to be capable of surviving at extremely cold temperatures in space, we humans would die pretty quickly.
b9Rdp TIL There's a persistent cultural phobia in Germany of air drafts. It is widely believed they cause sore throats or even pneumonia.
ADJVB TIL that, many years after chewing gum had been around, in 1906, the first BUBBLE gum ever sold was called Bilbber-Blubber
oBrRE TIL about Jaron Lanier, who at 13 convinced a university to allow him to enroll (where he took graduate-level courses) and at 16 built a canoe he sailed from Florida to Venezuela. He is considered a founding father of the field of virtual reality.
xVDWb TIL During the Great Plague of London, the City Corporation ordered the killing of all cats and dogs, in an effort to prevent the spread of the disease. It's estimated that 40,000 dogs and 200,000 cats were killed, however it was the rats spreading the virus, not cats or dogs.