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  1. National Pi Day

    National Pi Day—March 14—is a time to celebrate the number 3.14159. . . . Take a look at how this remarkable number has been honored in various settings, from a middle school classroom to the Exploratorium and Harvard University. Go to: http://www.germantownacademy.org/academics/MS/PiDay/Index.htm, http://www.winternet.com/~mchristi/piday.html, http://www.nvnet.org/nvhs/dept/math/pi.html, http://mathforum.org/teachers/middle/activities/pi_day.html, http://www.exploratorium.edu/learning_studio/pi/, and http://www.math.harvard.edu/piday/index.html

    By Science News
  2. Earth

    Lowering the Boom? Impact crater may predate extinction of the dinosaurs

    Analyses of sediments from the Yucatán in Mexico suggest that an extraterrestrial impact there more than 65 million years ago actually happened about 300,000 years before mass extinctions of dinosaurs occurred.

    By Sid Perkins

  3. Worst of Two Worlds: Hybrid mosquitoes spread West Nile virus

    Interbreeding between two Old World mosquito species may explain why their blood-sucking brethren in the United States transmit West Nile virus to people as readily as they do.