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TIL that vitamin D3 comes from human skin

Read more ncbi.nlm.nih.gov

via reddit.com

lo8vG TIL that sign language includes very few words about astronomy, making it hard for those who are deaf to talk about space. The International Astronomical Union just created about 50 signs to replace words like "constellation" that previously had to be spelled out letter by letter.
M70kK TIL All AmEx card numbers start with 3, Visa with 4, Mastercard with 5
vkbL TIL : In 2014 a cat saved its five-year-old owner (Ethan) from bullies, the bullies were teasing Ethan and when one of them shoved him on the ground the cat jumped on the boy’s chest and scared him off.Ever since the incident the cat sleeps outside Ethan’s bedroom to keep a watch.
9w0Kr TIL the Japanese word "saboru". In the early 1900s, "sabotage" caught on in Japan to describe industrial actions. However, it was shortened and took on a different meaning: "cutting classes" or "skipping work". Now it’s so casually used that even some native speakers don’t realize it’s a loanword.
y1Pa TIL while developing the 1994 hit game “Donkey Kong Country,” programmers found that real-life gorillas moved too slow for a fast-paced game. Instead, Donkey Kong’s movements were based off a horse’s gallop.