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TIL the HongKong Dollar being pegged to the US Dollar at a rate of 7.80 under the linked exchange rate system, where the government does not control the supply/demand in the foreign exchange market, exchange rate is stabilised by arbitrage where banks sell HongKong Dollar at a gain/loss.

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5YjGk TIL Teflon was introduced by DuPont in nonstick cookware in 1946 and was the very “forever chemical.” These types of chemicals are linked to many diseases, never break down in the environment, and are now present in the blood of nearly every American adult and newborn baby.
R7VV6 TIL of the murder of Henryk Siwiak. It's the only recorded homicide in New York on September the 11th, 2001, as the city does not include the deaths from the attacks in the official crime statistics; the murder remains unsolved.
aeeL TIL that Sammy Davis Jr. was an accomplished fast-draw shooter. Johnny Cash claimed that Davis could draw and fire a revolver in under a quarter of a second.
amjN TIL that some interns at Google earn up to $90,000
wLjDY TIL While filming Schindler’s List, Steven Spielberg called Robin Williams to do stand up over the phone for 15 minutes everyday to cheer him up. Also, some of Williams material ended up as dialog for his role in Aladdin as the Genie.