The forces of nature appear intent on reversing mankind’s progress toward better health.   An example is the ever-increasing resistance of bacteria to antibiotics.  A timeline of the existence of humans and bacteria shows that bacteria have been around for a very long time--- much longer than mammals, and much, much longer than humans.  In fact by the dawn mankind, bacteria had been thriving, relatively uninhibited, for over 2 billion years.

Modern humans have been around for 40,000-200,000 years or so, depending on...
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