The reviewer examines a recent, nonmathematical, book on the science of snowflakes, and then provides a mathematical discussion of snowflakes for Notices readers. (pp. 402)
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April is designated Mathematics Awareness Month and the theme for 2005 is "Mathematics and the Cosmos". The author has written three essays--variations on this theme. (pp. 417)
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Cohomology rings of finite groups provide an interesting and important class of commutative rings. Examples can be explored by computer calculations, which in turn lead to conjectures about their properties. The author explains what these properties are, what might be conjecturally true of them, and what has been proven so far. (pp. 426)
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