Forever chemicals, also known as PFAS, are found in virtually every corner of the world, including in most people’s bodies. These synthetic compounds have been linked to a wide range of health issues — from infertility to cancer to neurological problems — even at low levels of exposure. In a new book, They Poisoned the World: Life and Death in the Age of Forever Chemicals, investigative journalist Mariah Blake lays out how these toxic chemicals became so ubiquitous. Blake spoke with Apple News In Conversation host Shumita Basu about a group of unlikely activists fighting back against those responsible and offers practical tips to protect yourself.

For some resources recommended by Blake, go to the National Science Foundation’s page on PFAS in drinking water.