Capsaicin is a versatile compound. The active ingredient in chili peppers, it makes your enchiladas taste good. It’s beneficial to rub onto your aching joints if you suffer from arthritis. It can be used as a pesticide. And it’s often the active ingredient in bear repellent. Amazon uses robots like the one shown here for various tasks around its fulfillment centers. (Image source: Amazon) Bear repellent is conveniently sold on Amazon, so you need not leave the comfort of your home to...
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