tales of teaching

Okay, so this isn't about Isabelle, but it's a quote too good to pass up:

STUDENT: Can I have a rubber band?

ME: [suspecting catapult construction] What do you need a rubber band for?

STUDENT: I need it to hold a rolled up piece of paper.

ME: [seeing no such thing] And this rolled up piece of paper is where?

STUDENT: I just made it up so I could get a rubber band.