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TIL of Beer's law, which describes how light attenuates when traveling through a liquid. Named after a German physicist, the property was actually originally observed by a Frenchman looking at wine.

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R7N84 TIL Leonard Cohen originally wrote 80 draft verses for his song "Hallelujah." He chose several of the most relevant and interchanged some of them depending on where he was playing.
jxBM TIL Lincoln suffered from chronic depression: “He often wept in public and recited maudlin poetry. He told jokes and stories at odd times—he needed the laughs, he said, for his survival. As a young man he talked of suicide.”
VWP0 TIL that according to neuroscientist ‘Sam Harris’; humans are just robots without real freewill, and that our brain activity can been used to predict our decisions up to 10 seconds before we become consciously aware of it.
9Ydkm TIL that a paper centrifuge has been designed by Manu Prakash in 2016 based on spinning toy, whirligig. It can reach 20,000 rotations per minute and can be used to separate plasma from blood and malarial parasites, operate with hands without electricity and costs 20 cents.
D1ZWv TIL Al Capone was one of the first civilians to receive penicillin for treatment. However, it was already too late to cure his syphilis by that time.