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TIL A Mars mission would expose astronauts to radiation levels equivalent to receiving a whole-body CT scan every five or six days and increase their risk of cancer by 5.5%; NASA scientists consider this the “elephant in the room” with regard to any deep space missions

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loWa1 TIL JK Rowling told Harry Potter actor Daniel Radcliffe that "you and Rupert and Emma are all too good looking" for their roles because she imagined her characters to be geeky looking
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.
5VQJQ TIL that in "Maleficent", Angelina Jolie's own daughter had to play the younger version of Aurora, because they were unable to find any other young girl who wasn't too scared to go near Angelina in her Maleficent costume.
Y6B TIL University of Washington students created an artificial intelligence program to detect “that’s what she said” jokes.
j6Lxp TIL there was a proposed US annexation of the Dominican Republic under President Grant. The bill failed in the Senate because of Liberal Republican opposition, and directly contributed to the Liberal Republicans running Horace Greeley to oppose Grant in the 1872 election.