Alanna Collen is a science writer with a master's degree in biology from Imperial College London and a PhD in evolutionary biology from University College London and the Zoological Society of London. She lives in Bedfordshire, England, with her husband.
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You are just 10% human. For every one of the cells that make up the vessel that you call your body, there are nine impostor cells hitching a ride. You are not just flesh and blood, muscle and bone, brain and skin, but also bacteria and fungi. Over your li... SEE MORE