Paper (formulas, books & shit).........toilet paper.
Without it, you'd be wiping your ass with your hand.
.
.
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In other parts of the world, people handshake with their non-wiping, non-smelly hand. That's pretty fucked up.
Plumbing is the greatest invention of all time. Without a doubt. Cholera and other diseases have been vastly reduced (where plumbing is the norm). The Roman Empire fell, not because their society went to crap (no pun intended), but because the invading forces cut off the water being delivered to Rome by the miles long Aquaducts. If you don't agree with plumbing, just for a minute think about how your life would be affected, if you had to daily lug buckets of water from the nearest water source, probably polluted, for your all your household needs.
Indoor plumbing is a wonderful convenience. No more going out in minus zero degree weather to do your business. And who wants to volunteer for cleaning out the outhouse bucket? Think of the hot showers or baths that you would miss out on.
When I was a kid in Boston, I use to visit the Museum of Science. They had a giant map/chart on display of the city, the surrounding communities and the harbor. There were lights that pinpointed a half dozen locations, where the untreated waste water was dumped into the harbor. Every year, I'd visit the museum and see the display of the unresolved dumping of untreated waste water. It took decades before a Federal judge ordered a solution and the building of that waste treatment project was completed.
My heart goes out to the families of Flint, MI. This should not have happened in this day and age.
Oh, and about the toilet paper vote. First of all, this is why people of the 3rd world
only shake hands with their right hands. But there are some alternative solutions. I remember when I hiked in the Appalachian Trail, with no toilet paper. Those plants with big leaves were what I reached for. Fortunately for me, none turned out to be poisonous.