well, I guess this explains why I couldn't find that eraser.

It was mostly eaten by the furry menaces cohabiting with me. I either must have dropped it, or they made away with it when I didn't look. I found the stubby remnant (less than a fourth of it's original size) below a shelf today. It's a wonder rats don't all die from bowel obstruction and the like considering that they insist on gobbling up inedible stuff. Well, in practice rubber seems mostly harmless for them, they chew it up in small pieces and those aren't sharp or anything, so unlikely to injure. But still. I give them plenty of tasty stuff, why did they have to eat my eraser? It was one that I quite liked because it worked well too. *sigh*