'Take a moment and think about all the places you’ve walked today. I went to the pet store (needed a new litter scoop), the grocery store (needed more produce to make our super smoothies), storytime at the local library, then a playdate where we walked about a two miles on residential streets and dirt trail. Oh, and then I went jogging at the track at our neighborhood junior high. All in all, an average day. Just off the top of my head I can think that my shoes were exposed to a variety of different animal poop, all sorts of different little bugs that I unknowingly squashed, LOTS and LOTS of chemicals from leaky cars on the residential roads and parking lots, chemicals used to clean the library carpets, pet and grocery store floors.'