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TIL that Porphyria, a collection of diseases where symptoms include severe sun sensitivity, prominent canine teeth and peculiar behaviour, is thought to be the basis of the vampire legend

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XEyDX TIL: Humans have a faster reaction time to audio cues than visual cues. There is also a significant difference between male and female reaction time, as well as between sedentary and regularly exercising individuals.
6VoJ TIL that Carlos Hathcock, USMC in Vietnam, crawled inch by inch, 1500 yards for 72hours straight to assassinate an NVA General, narrowly escaping being bitten by a viper, and almost being stepped on by a NVA soldier. He successfully completed the mission, and escaped the same way he had entered.
BgKJk TIL that from 1929 to 1955, the chairman of the NAACP was a Caucasian man named Walter White.
61vm TIL that the flag of Nova Scotia was only officially adopted in 2013, even after 155 years of use, when an 11 year-old girl researching a project realized that it had never been officially recognized in all that time.
yVGWe TIL: A pineapple is not a single fruit, but a group of berries! Banana is a berry too!