You use it every day but it was hiding a secret purpose all this time! Take a look at your keyboard: why do letters F and J have those ridges? And did you notice that each time you make an omelette, there’re strange red spots in eggs after you crack them? Common objects have hidden purposes you never knew about until now. It’s time to reveal them!
https://youtu.be/bYeAXWtg2Co
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