There's been a lot of talk recently about bisphenol A, or BPA, which is most commonly found in polycarbonate plastics. These are the plastics used in baby bottles and Nalgenes, the kind that are rigid and unlikely to break when dropped. BPA has been found to disrupt the processes of the endocrine system in animals, but it is still unclear what, if any, the effect on humans is. Still, the news today is that the Canadian government is poised to declare the chemical as toxic when used in food and water containers because it leeches out into its container's contents. We've all tasted plasticky water after having left a bottle in the car all afternoon—part of that taste is BPA.