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TIL on April Fool’s 2002, 2 radio DJs suggested Kansas’ water supply was contaminated with “Dihydrogen Monoxyde” (H20), announcing it caused excessive sweating and wrinkled skin. It led to thirty 911 calls, water officials comparing it to a terrorist act, and both DJs being suspended indefinitely.

78Y9Z TIL of the iQue Player, a handheld Nintendo 64 system released only in China after video game consoles were banned there in 2003. Content servers were still up until 2018.
grVlD TIL in the 1980s, parents were upset at a Seattle firm about phone bill charges after a half-hour show featuring Santa told children to hold the telephone up to the TV whereupon touch-tone sounds would dial a 1-900 number. A spokesman said this was to prevent children from dialing the wrong number.
LeJZ TIL : In 1966, French teen pop star did not know her huge hit song (she thought was about a lollipop) had a risqué double meaning. Upon learning this, she went into hiding for weeks.
X07MX TIL a startup called "Novamin" marketed a bioglass for toothpaste that can repair damaged enamel; GlaxoSmithKline bought the company in 2010, pulled it from every US toothpaste brand, and now sells it exclusively overseas as Sensodyne Repair and Protect which in the US instead includes fluoride.
QJBa6 TIL that the science of bite-mark comparisons, ballistic comparisons, fingerprint matching, blood-spatter analysis, arson investigation and other common forensic techniques have been tainted by systematic error, cognitive bias (tunnel vision) and little or no research or data to support it.