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TIL:When flatworms mate two"males" use their bifurcated penises to fence one another. The winner of the flatworm who stabs the other with its penis remains male while the loser becomes female.

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a56J TIL that it is a very common misconception that the poinsettia is poisonous. The rumor started when a 3yo’s death was falsely blamed on poinsettia, and it has been passed on that poinsettias are poisonous for about 100 years.
GYp4G TIL that Edgar Allan Poe invented the first fictional detective and directly influenced Arthur Conan Doyle's Sherlock Holmes, who made his first appearance 45 years after Poe's death.
YpjjZ TIL that First, Second, and Third World referred to political affiliations during the cold war (NATO, Warsaw, Unaffiliated) and not about the strength of a country's economy.
jxaR TIL In 2013, you can re-use calendars from these years: 2002, 1991, 1985, 1974, 1963, 1957, 1946, 1935, 1929, and 1918.
mkbv TIL that a Muslim cable TV network was created in 2004 to counter “extreme stereotypes” of Muslims. In 2009, the founder of the network was arrested for beheading his wife.