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TIL typefaces (fonts) are not protected by copyright in the United States as they are considered to be “utilitarian objects whose utility outweighs any merit that may exist in protecting their creative elements.”

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jN7wE TIL that human hair can be used to accurately measure relative humidity in the air. Human hair hygrometers have been in use since the 18th century.
v1wdK TIL The legal definition of a 'sandwich' differs across the USA. In California, a hot dog is a sandwich. In Massachusetts, a burrito is not a sandwich. The USDA defines a sandwich as meat between two slices of bread and says a burrito is a 'sandwich like product.' New York has another definition.
R54BQ TIL serial killer David Berkowitz, better known as the Son of Sam, wrote a letter in response to the 2002 D.C. sniper attacks in which he told the shooters to "stop hurting innocent people".
mx07O TIL when the game Twister was first introduced in 1966, one of Milton Bradley’s competitors denounced the game & accused them of selling “sex in a box”, & Sears refused to put it in their catalog, deeming it inappropriate. But after Johnny Carson featured it on ‘The Tonight Show’, sales skyrocketed.
LQvRp TIL Hannah Upp, who was diagnosed with dissociative fugue, disappeared three separate times (2008, 2013, 2017) & remains missing today. Her disappearances spanned 20 days, 2 days, and 7 years & counting. All three occurred in September & were in some way connected to a body of water.