system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If you throw a wad of wet, scrunched up toilet paper at a wall, it sticks even after the water has evaporated out of it. How come?

I’m sure most people have seen wads of paper towel and toilet paper stuck on public restroom walls and ceilings, from people who wet them and then threw them against the surface. If you were to throw a dry piece of paper at a wall, it wouldn’t stick, so, on a more molecular level, how come the TP continues to stay in place even after the water has dried out of it?
gpt
Paper is basically wood pulp (often with other additives), held together by glue. In toilet paper specifically, the glue is very soluble in water. This is so when you flush it, the glue melts, and the paper dissolves. If you throw wet toilet paper at the wall, the glue is partially dissolved, and will stick to the wall. When it dries out, it's still stuck to the wall.