Since the World Health Organisation declared  COVID-19 a pandemic , progress has been made on testing, tracing and treating people infected with the virus, and industries have developed  several vaccines in a record time.

If aliens were to examine a human, they would think we were just slavish organisms designed to feed microbes and carry them around. Our bodies contain ten times more bacteria than cells , and there are an estimated 3.

Genes are the latest trend in nutrition, at least going by the burgeoning  legion   of Internet companies offering diets tailored to our genetic make-up.  These services are relatively affordable and simple to use.