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TIL there is a hard version of Tic-Tac-Toe

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5YVkp TIL: The term "Patient Zero" was a misunderstanding. It referred to a Canadian man named Gaëtan Dugas, who was linked to the AIDS epidemic in the '70s. He was a flight attendant that scientists dubbed "Patient O, the outside-of-California case". The O was later misinterpreted as the number 0.
9wbXm TIL Elephants can distinguish human voices by sex, age, ethnicity, and language.
x64nk TIL the author of the Dr. Dolittle series, Hugh Lofting, created the book in a series of letters to his children while he was fighting in the First World War as a way to spare them from the horrors he was witnessing being committed on both humans and animals alike
VMlMk TIL 64% of Americans believe schizophrenia involves a split personality. A person with schizophrenia doesn't have two different personalities. Instead, he has false ideas/delusions or has lost touch with reality. Multiple personality disorder is unrelated.
XE1Qj TIL there's a Batman miniseries called "White Knight" which reverses the roles of Batman and the Joker. The comic takes place in world where Joker has been rehabilitated and now has to save Gotham City from the Batman.