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TIL in 2015 a new antibody test was announced by a researcher at Brigham and Women’s Hospital in Boston that can reveal every virus your body has ever mounted a response against. The researcher estimated it would cost $25 per test.

Read more nbcnews.com

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vdL TIL J.K. Rowling told Alan Rickman (Severus Snape) secrets about his character and the final books, before they were written, so he could better develop his character.
eNXk TIL Snackman, the guy who stopped a subway fight by standing between two combatants and calmly ate chips, was inundated with marriage proposals and date requests after video of the brawl went viral.
jNWlp TIL the Okinawa Islands were home to the Ryukyu Kingdom, which was culturally & politically distinct from Japan. Though its languages were related (though unintelligible to) Japanese, they were seen as a foreign people with a different culture, before it was annexed into Japan & mostly assimilated.
grwdy TIL the West Australian Christmas Tree (Nuytsia floribunda) is a parasitic tree that sends out roots up to 150m (492ft) to attach themselves to any nearby trees and plants to draw water and nutrients from them. Almost all species are susceptible to attack.
N7mPP TIL that Screech Owls keep blind snakes as pets/housekeepers. The snakes are carried to the owl's nest, and then burrow into it and eat bugs that would otherwise pose a threat to the owl's young.