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TIL Guinness stout has fewer calories than skim milk, orange juice, and many popular beers

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kLgm TIL: There are still people around with plutonium-powered nuclear pacemakers implanted in their bodies. 9 were still working as of 2007, 35 years after implantation. They work on the same thermoelectric principle as the New Horizons spacecraft’s power source.
wLkEY TIL the "Dog Days of Summer" doesn't have to do with dogs laying around during the hottest days of the year, but the location of Sirius in the night sky
Ooxra TIL despite being a popular trope in crime fiction, it's basically impossible to quickly incapacitate someone with a chloroform-soaked rag. It generally takes about 5 minutes of inhaling the substance to render someone unconscious
1abxX TIL about Quaker and slave trader Zephaniah Kingsley, Jr. who advocated, and practiced, racial mixing as a way toward ending slavery. These views were tolerated in Spanish Florida. After Florida became a U.S. territory in 1821, he moved with his multiple "wives", children, and slaves to Haiti.
d8dQr TIL that porcupines sometimes fall out of trees and injure themselves on their own quills. As a result, they have evolved to produce a topical antibiotic on their quills to protect against infection from self-wounds.