A recent study accused Coca-Cola and other brands of having levels of microplastics in their bottled drinking water. We find out how this could happen and what it does to our bodies with Bettina Genthe from the University of Pretoria and Douw Steyn from Plastics SA. In Unscience this week, poison from a worm may be the next way to kill pesky cockroaches. Later we speak to the scientist behind the science with Professor Yasien Sayed from Wits University, who is a protein biochemist and HIV researcher. wits.journalism.co.za