system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why can't you remove the crease from paper?
gpt
Paper is so common we take it for granted.  This is a great question.  Paper is a mat made from the pulp fibers of wood, and sometimes other plants or materials like cotton, etc. when you crease it you shift the fibers and probably break some. That makes it difficult, if not impossible, to get back to the smooth state.