Much happiness this month when my new issue of Wired showed up with an article titled "Glass Works: How Corning Created the Ultrathin, Ultrastrong Material of the Future". Then I read the full article and got a wonderful description of tempering (tension/compression) and substitution tempering (dipping in a molten potassium salt) to adjust the properties of the glass. Plus it's all about the Gorilla Glass's that's used in the iPhones (and other touch-screen technologies), so it's stuff the kids actually will know about.
Check out the full article at the link above.
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