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TIL that Albert Baez, the father folk singer Joan Baez, while enrolled at Stanford's doctoral program in physics co-invented (with his doctoral program advisor) the X-ray reflection microscope for examination of living cells. Later in his career he helped develop the x-ray telescope.

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VAvk TIL the Australian skink (a lizard species) lays eggs in some regions and gives live birth in others, thus illustrating evolution in real time
LkjGp TIL - Six Flags used to stage mock Union-spy executions in their Confederate-themed area
wyJP TIL a blind taste test found most people are unable to tell the difference between a cheap wine and an expensive one.
mnox TIL that Koala’s have the lowest brain to body mass of any mammal which means they are not very intelligent, for example, they can on eat Eucalypitus on branches but if you place the leaves on a plate, they would not be smart enough to know it is food and eat it.
W1YY TIL that in 2010 men were “forced to penetrate” 1,267,000 times (page 29), nearly as many times as women were raped (1,270,000 times; page 28)