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TIL in the UK at any one time, there is an average of 3.8 billion genuine banknotes in circulation, with a notional face value of around £75 billion.

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BGor TIL American Airlines went against manufacturer recommendations and used their own maintenance procedure to save 200 man hours of labor per aircraft. This resulted in one engine of AA Flight 191 separating from the wing on takeoff and the deaths of 273 people.
nxWG TIL that if you plant an apple seed, the resulting tree will not produce the same kinds of apples. In fact, they will taste significantly different and may be unsuitable for human consumption.
GdKN TIL that Google made a detailed, interactive map of the galaxy in HTML5, just to see if they could.
ywve TIL the highest mountain in Australia is named after the Polish national hero, Tadeusz Kościuszko, who was also a military leader in the American Revolutionary War, and personal friend of Thomas Jefferson.
PBlG Today I learned that while some have been destroyed through friendly fire, not one M1A1 Abrams tank has ever been destroyed in combat by enemy fire.