Yeah, wish I had thought of that one too! <img src="/images/graemlins/smile.gif" alt="" /> I third that vote.
I thought of including a hand-sized digital camera or video/still combo that's not going to be a drastic loss if it's broken or lost. I just wasn't sure about the cost ceiling.
Telescopes, GPS, and other fun outdoor gadgets that get kids excited about the outdoors come to mind as well.
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Experience is a hard teacher because she gives the test first, the lesson afterwards.