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Lighting Up Materials Why is the material Kevlar tough enough to stop a bullet? Learn the answer to this and other questions about materials at MicroWorlds, a Web site developed by the Lawrence Berkeley National Laboratory to highlight its Advanced Light Source (ALS). MicroWorlds describes how the ALS operates as a powerful source of x rays and the sort of research (including student-initiated experiments) performed at this facility. The site also features simple home activities to illustrate basic concepts in materials science. A monthly puzzler challenge offers students a chance to win a T-shirt. Go to: http://www.lbl.gov/MicroWorlds/Contents/Contents.html
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