DS's math mentor was just reading this book with him this week:

http://www.amazon.com/Dogs-Were-Din...mp;s=books&qid=1264815694&sr=8-1

It's a neat book about proportions. Apparently DS wants to solve this problem: if a computer monitor was the size of Mount Everest, how big would a computer key be? I guess they are going to do some research and figure it out together.