You know all those cool tiny parts that make up the universe? The invisible particles and micro-organisms and molecules that we can’t see, but play that their own crucial parts in keeping the world in harmony? Well, microplastics are just like them. Except they’re plastic, we made them and they don't help keep anything in harmony. So what are they and where can they be found? How can we try to filter them out? What do they to do people and animals? And just how much of them are we eating, or drinking, or even breathing right now?  GUEST: Rachel Chen (Read Rachel's guide to microplastics at Chatelaine.com)