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TIL the "Dementors" which were first introduced in "Harry Potter and The Prisoner Of Azkaban" represented JK Rowlings severe depression.

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dDE58 TIL in 1965, Pastor Shuttlesworth was arrested for leading a march in Birmingham. The Supreme Court overturned the ruling, saying the law was so broad that a person "may stand on a sidewalk only at the whim of any officer of that city."
9w0mD TIL the US accidentally dropped four nuclear hydrogen bombs on Spain in 1966. Two of them partially detonated and one was lost for 2 months and a half.
Oo8WR TIL of the "Fighting McCook" family of Ohio. Two brothers, Daniel & John, & thirteen of their sons were involved in the Union army, making the family one of the most prolific in American military history. Six McCooks reached the rank of brigadier general or higher.
nW6LG TIL the Swiss Cheese Model is a form of risk analysis that proposes some errors are caused by flaws in multiple systems aligning, like the holes in different slices of Swiss cheese.
GAJMG TIL that according to the researches - increasing your physical activity does not have direct linear relation to your calories consumption. Our organism adapts and stops the consumption by other sources, which results in only 5-15% increase in daily calories used despite the ammount of activity.