I was demonstrating how to make an entry into a math journal today when I made a mistake. I reach into my desk and grabbed a white-out tape dispenser. The kids were watching in fascination as I "erased" the mistake.

Jonah: What's that!?

Aspen: Duh. It's wipe-out tape.

Jonah: Wipe-out tape?

Aspen: Yeah, it wipes out your mistakes.