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TIL fire burns faster uphill. For every 10˚ slope, the fire will double its speed. For example, if a fire is travelling at 5 km per hour along flat ground and it hits a 10˚ slope it will double in speed to 10 km per hour up the hill.

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9Y0oX TIL in 1864 when Congress reintroduced the Nickel currency bill they wanted the likeness of Clark on the bill, in reference to soldier William Clark, however the head of the Currency Bureau Spencer M. Clark used his own likeness, which directly led to the abolishment of the Nickel currency bill.
RAnQ TIL Yale university’s class of ‘54 at their reunion raised $375,000 with the idea to invest it in a risky portfolio that grew 37% per year to $90 million, which they donated to the university.
4Xwk5 TIL Bell Peppers contain more Vitamin C than oranges do, and contain higher amounts the riper the color becomes. A cup of chopped Red bell pepper "contains nearly three times more Vitamin C than an orange—190 mg."
gWZ7 TIL during the Cold War, an 18 year old German aviator (with only 50 hours worth of flying experience) illegally flew through Soviet airspace, bypassed their air defences and landed in Red Square, all in order to reduce tensions between the US and USSR.
R59e4 TIL that Al Pacino, who played Michael Corleone in The Godfather, grew up living with his grandparents, who immigrated from Corleone, Italy. His childhood nickname was Sonny.