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TIL Grand Central Station in NYC is radioactive due to the natural radioactive elements found in the granite used in its construction. If Grand Central Station were a nuclear power plant, it would be shut down for exceeding the maximum allowable annual dose of radiation for employees.

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NXVvM TIL the "empty London" scenes in 28 Days Later were achieved by filming at dawn and simply asking people to stop walking through shots, as there was no room in the $8m budget to actually shut down any parts of the city.
5VQaD TIL that humans are more closely related to cats than dogs.
o8GW TIL that in 2014 Sony made a cassette tape that could hold 185 terabytes of data or the equivalent of 3,700 Blu-ray discs.
Grl1 TIL during World War II, the US sent former major league baseball catcher and OSS agent Moe Berg to attend a lecture from Dr. Heisenberg. Berg was armed with a pistol and had orders to shoot Dr. Heisenberg if his lecture indicated that Germany was close to completing an atomic bomb.
n7XW TIL Isaac Newton was elected as a Member of Parliament in 1689 and served for exactly one year. During that time, he said one and only one sentence during the lengthy proceedings: he asked a nearby usher to close an open, drafty window.