All the Facts on the Ins and Outs of Bodily Functions! We call them waste products, but poop and pee are essential to our everyday lives. Did you know the chemicals in pee can be used to reduce city smog? Or that poop can fuel a trip to Mars? While we politely avoid the subject, amazing things are happening in digestive tracts all over the world, and you won’t believe some of the gross-but-true details! Kids (and adults too!) will be captivated by the astounding facts contained in this fascinating book with hilarious illustrations!