In this explainer video for DNews (Discovery's YouTube arm), hosts Jackie Koppell and Trace Dominguez break down the science of sweat, body odor, and deodorant. If you have any super-organic friends, they've probably lectured you about how evil deodorant is, hopefully from a safe distance. But are these unscented naysayers like Matthew McConaughey​ right? Well, they're right that our underarm products do more than just cover up smells: they plug up sweat glands and mess with the bacteria that feed on that sweat (making smelly byproducts). Sometimes they even help make superbacteria (maybe)!