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Today I learned that the slang word “stan” originates from an Eminem song of the same name, a portmanteau of “stalker” and “fan”. The connotation was originally negative.

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KOrBJ TIL there is a ship which can turn 90 degrees vertically, leaving most of it underwater, transforming itself into an underwater lab
GAkRQ TIL: “His Master’s Voice” was originally a painting by an artist of his later brother’s dog Nipper (so named because he’d nip people’s ankles). He also would listen intently to a recording of his dead master’s voice.
JPpl TIL that the German word for foolhardy is “tollkühn” and that is where Tolkien derived his surname from.
NX5yQ TIL of Kangri cancer, a squamous-cell carcinoma of the skin, found only in Kashmir in the northwest of the Indian subcontinent, due to the use of a kanger, a ceramic pot covered with wicker-work, carried for warmth during cold weather. It develops from erythema ab igne, AKA hot water bottle rash.
Wkr1Y TIL that "dietary supplements" in the United States don't need to pass any safety inspections or testing. Manufacturers don't have to prove their products are safe, or even effective, and the FDA can only remove an unsafe product after someone gets sick, dies, or files an "adverse event" report.