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Short answer: It's automated

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nZwd TIL, the Civil War prison camp Elmira had two observation towers constructed for onlookers. Citizens paid 15 cents to look at the inmates. Concession stands by the towers sold peanuts, cakes, and lemonade while the men inside starved
07Wp TIL that the SR 71 design could actually go to mach 6 speeds if it wasn’t for the material melting past mach 3.3
xV8XB TIL After a composer released a song that was just 60 seconds of silence, he was sued by the estate of a man who had released a similar track, called 4 minutes and 33 seconds of silence. His defense was, "I have been able to say in one minute what he could only say in four minutes and 33 seconds"
o1vA TIL In 24 states, you will pay sales tax on Hershey’s bars but not on Twix. This is because those states define candy as flour-free in their sales tax code and Twix contains flour, making it a grocery item.
mxgoO TIL Some of the oldest preserved female litterature come from poems by early Buddhist nuns in 6th century BCE (2500 years ago!). The women express their spiritual equality to men, and issues such as child mortality. They also discuss the role and abilities women in society