Microplastics cover every inch of our world, from the rain forest to Mount Everest — they’re even in our lungs. Much remains unknown about their impact on our health, but so far the research paints a bleak picture. In his new book, A Poison Like No Other, science journalist Matt Simon breaks down some big and small changes we can all make to mitigate our exposure to microplastics and reduce their spread. Below are excerpts from his interview with Apple News In Conversation host Shumita Basu.