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TIL calculus is another word for tartar (hardened dental plaque).

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ep0RE TIL the term for bad breath, halitosis, was popularised by Listerine to sell more mouth wash. Also that Listerine used to make cigarettes!
OodJa TIL 'The Spy Who Shagged Me' in the Austin Powers series is an Academy Award nominated film (for best makeup). It also won a Grammy for Madonna's 1999 song 'Beautiful Stranger' (for best song written for a motion picture, TV or other visual media).
V48G TIL of “fagging”, a practice in British private schools where younger students were required to act as personal servants to senior students (the fag-masters). Sexual abuse was rampant in this system.
KYZLE TIL that the last Space Shuttle mission carried only 4 astronauts because of the contingency plan to accommodate them on ISS in case the orbiter had to be abandoned
6EkGw TIL despite Switzerland being renowned for it's neutrality, Sweden has actually been at peace longer, celebrating 200 years of neutrality in 2014