Humans in the developed world spend more than 90 percent of their lives indoors, where they breathe in and come into contact with trillions of life forms invisible to the naked eye: microorganisms. — Jessica Green Copy Share Image
Humans in the developed world spend more than 90 percent of their lives indoors, where they breathe in and come into contact with trillions… — Jessica Green Copy Share Image
Our bodies are home to trillions of microbes, and these creatures define who we are. — Jessica Green Copy Share Image
