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TIL that there is a punctuation mark for sarcasm. Introduced in 2010, the "SarcMark" looks like a reversed 6 with a dot in the middle. It is used just like the question mark or exclamation mark, except this mark indicates irony or sarcasm. However, anyone hoping to use it must pay $1.99 (£1.20).

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nWpgG TIL In 1974, Richard built the world’s first 16-bit personal computer. Eric programmed the machine. A year later, Scott authored the first graphic video game for a personal computer.
9Yo5D TIL the Feynman Lectures on Physics, freely accessible online, is widely appreciated to be one of the most well written summaries of physics, and fully grapsing its brilliantly intuitive explanations allows one to enjoy a true understanding of the concepts
XyLD TIL that curly hair is curly because the hair follicle it grows from is oval and straight hair is straight because the hair follicle it grows from is round. Straight hair is like a straw (except tinier) and curly hair is like a slightly squeezed tip of a straw.
G9pN TIL people who are starved appear to have a large abdomen due to water retention as a result of protein deficiency
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