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TIL: The Phillips head screw was invented by a guy named Thompson, who for some reason issued the patent to Phillips

Ree9 TIL The tarantula hawk stings and paralyzes a tarantula, drags the specimen to a brooding nest, and lays a single egg on the spider’s abdomen. The wasp larva hatches, creates a hole in the spider’s abdomen, and enters to feed, avoiding vital organs for as long as possible to keep the spider alive.
neOlG TIL of Motts Tonelli, a Notre Dame fullback who ran in the winning TD against USC in 1937. 5 years later in 1942 he had his class ring confiscated during the Bataan Death March. A Japanese officer returned his ring, telling Tonelli that he was US-educated and recognized him from his time at USC.
j678p TIL about Romanian Princess and socialite Marthe Bibesco. Marthe lived as a travel writer, political exile, and poet—with high-society affairs scattered all over the European map. A muse to kings and poets alike, she is considered Romania's most influential woman of the millennium. (1886 - 1973)
W7jkA TIL that the US Air Force has a missile called the CHAMP capable of damaging electronic systems by means of an EMP (electromagnetic pulse).
VrZk TIL Harald Hardrada was a Viking who fled from his native Norway to Russia, then went on to become an elite guardsman in Eastern Roman Empire and fought in Iraq. He then return to Russia to marry a princess and arrived back in Norway as a king and finally invaded England with his army.