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TIL that World War II WASP pilot Katherine Dussaq married the inventor of the polygraph machine and was herself a renowned forensics expert who ran an all-women detective agency. Katherine died in a service-related crash in November of 1944, only weeks away from the disbanding of the WASP.

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NXPa1 TIL not only does water only block 20% of UV rays with 3 feet of depth, but also the water surface reflects UV rays so being around water increases UV exposure
Oo5vL TIL the word "aint" was added into Webster's Dictionary in 1993, meaning it's been considered a legal word for over 26 years
9yKM TIL spelling bees are a particularly American/British phenomenon. Other languages spell their words so intuitively that one can easily spell them just by hearing them. English, on the other hand, contains Latin, Greek, Germanic, etc. roots, not to mention whole words borrowed from other languages.
e0kx4 TIL that in 1997 the largest known viking ship 'Roskilde 6' was discovered buried beneath the Roskilde Viking museum during the construction of an extension.
E14Pd TIL All dogs have been banned from Antarctica since 1994