prime numbers.

Here's a funny thing that just happened.

I'm at the library again, big surprise.  In the study cubicle across from me, a fifth grader and his dad are doing some math homework.  The boy just said, "And prime numbers... I forget what a prime number is," and the dad said, "Me too."

I became immediately determined to remember what a prime number was before the dad could look it up.  I rattled off the thoughts in my head.  Prime numbers, prime numbers... one, three... can only be divided by something.  Themselves.  Themselves and one.  And then the dad said, almost as I was thinking it, "Here, a prime number is one that can only be divided by itself."  And one, I thought.  "And one," he added.

I had a little silent celebration on this side of the cubicle, glad they couldn't see me.

This is a big deal for someone who still can't remember how to do long division, and probably never will.  Is it sad?  Me being so proud of myself for remembering the definition of a mathematical term?

Seriously, I'm considering throwing a party.