Opinion: What We Flush Down the Toilet Matters. Only the ‘Three Ps,’ Please

What goes in the toilet, and what goes in the trash? It’s the kind of discussion one has with a 2-year old, and is all the more delightful because it’s a topic generally regarded as taboo in polite conversation. You get to say things such as only “the three Ps” — pee, poop and paper — go in the toilet. Everything else goes in the trash can. Right?