'Do you remember the "hygiene hypothesis" of the late 1990s? It theorized that humans had so over-sanitized their environment with disinfectants and hand cleansers, our immune systems were no longer doing their jobs. So many consumer products like toothpaste, hand and dish soap, laundry detergents and even clothes now include antibiotics, said the theory, we seldom encounter the "bad" germs our immune systems are supposed to recognize and fight.'
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