### Kenneth M. Golden

Mathematics Awareness Month 2009 has as its theme "Mathematics and Climate Change". Polar sea ice both regulates climate and serves as an indicator of climate change. Brine flow through sea ice figures in the regulation, and its measurement helps in calculating climate change. The author explains mathematical modeling of brine flow and reports on Antarctic measurements checking the models.

(pp. 562)

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### Walter Willinger, David Alderson, and John C. Doyle

Graph theory models the Internet mathematically, and a number of plausible mathematically intersecting network models for the Internet have been developed and studied. Simultaneously, Internet researchers have developed methodology to use real data to validate, or invalidate, proposed Internet models. The authors look at these parallel developments, particularly as they apply to scale-free network models of the preferential attachment type.

(pp. 586)

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