Thanks for that, frenchy. I know the MythBusters did a small test of what kind of books and so forth are bulletproof, but I don't remember their specific results.

On another note, it's nice to know that the backpack I lugged around in high school would have made a nice frag shield. I can guarantee that there was at least a 9-inch stack of books in it every single day. It made the P.E. coaches mad because my bag didn't fit into their stupid lockers, so I had to put my bag in the coach's room (which locked).
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“Hiking is just walking where it’s okay to pee. Sometimes old people hike by mistake.” — Demitri Martin