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One minor side effect of this terrible pandemic is that we have all become more educated on our own immune system.\xa0 Looked at objectively, it is a masterpiece of evolutionary excellence.\xa0\nThe outward signs of infection are normally easy to see \u2013 coughing, sneezing and obvious fever warn other humans to keep away, while our own exhaustion makes us less mobile and thus less likely to infect.\xa0 The extraordinary havoc wrought by Covid-19 is primarily due to the virus\u2019s ability to make someone contagious even before these symptoms appear.\nFor additional insights from Dr. David Kelly, listen to the Insights Now podcast.