Remember when my daughter was learning to bake and mixed up the salt and sugar in chocolate chip cookies? We took one bite and just about spit them out! But now we call them "salty surprise cookies" and laugh every time. That mess taught her to double check labels better than any lecture ever could.

Anthony's totally right. My old university notes from like ten years back are basically ghosts now. The pencil sketches I did in the margins have completely faded away. A coffee stain on one page ate through the ink, so a whole paragraph is just gone. It's a real shame, I wish I'd taken a picture of them back then. Scanning them while they're still clear is definitely the move.