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TIL that mayonnaise consists of only four ingredients. Egg yolk, oil, salt and some acidic ingredient such as vinegar or lemon juice.

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p8LMb TIL of Flossie Wong-Staal, a pioneering HIV/AIDS researcher who performed nucleotide sequencing on HIV to map its entire genetic makeup and to elucidate its many variations. Such research helped improve the medical outlook for millions of HIV/AIDS patients around the world.
1doP TIL Colby Nolan, a cat, was granted an MBA from Trinity Southern University of Texas in 2004 as part of an investigation to uncover the school as a diploma mill
7rVkx TIL as composer Mike Greene was working on the "Bill Nye The Science Guy" theme song, a rap group was also recording inside his studio. He called them over to chant "Bill!" into the mic. It wasn't until the show aired that they knew why.
KLa4 TIL of a thousand year old rosebush in Hildesheim Germany. It even survived world war two, despite the fact that the church it grows next to was destroyed by allied bombers.
mxxGO “Across the atmosphere of Earth, lightning flashes about 50 times per second. That’s 4.3 million times a day and roughly 1.5 billion times a year.”