Introductory web sites about materials science and engineering

I an giving a talk to a group of high school students about materials science and engineering. It will be useful to have a list of interesting web sites for them to
visit. The following list shows what I have so far. Can anyone suggest more sites that would be interesting at an intorductory level?
Discovering Materials Science,
Career Resource Center for Materials Science and Engineering, /
IOM3 Materials Careers (UK),
The A to Z of Materials,
Matter, /
Key to Metals (See articles)
Key to Steel (See articles)
Virtual Materials Science Center,
Pittsburgh Pete
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