For anyone deeply interested in logic and the history and philosophy of zero, Hossein Arsham of the University of Baltimore offers an thought-provoking Web-based discussion of such topics as the meaning of division by zero, the role of zero in limits and divergent series, and the concept of zero as a void.Go to: http://ubmail.ubalt.edu/~harsham/zero/ZERO.HTM

Is your name Bob? Want to see how many lakes in the United States are named after you? (Twelve in all, and four of them are in Michigan!) The U.S. Geological Survey's Geographic Names Information System (GNIS) contains data about nearly 2 million geographic features in the United States. Just enter a name or any other word to find out where it is "officially" honored.Go to: http://geonames.usgs.gov/pls/gnis/web_query.gnis_web_query_form

The Robot Zoo Web site, developed by the Tech Museum of Innovation in San Jose, Calif., captures some of the charm of a traveling biomechanics exhibit featuring giant robot models of animals. These fanciful contraptions provide insights into how chameleons, bats, and other animals eat, move, and see.Go to: http://www.thetech.org/exhibits_events/traveling/robotzoo/

The Earth Science Picture of the Day Web site features photos, satellite images, and illustrations that highlight the diverse processes and phenomena shaping our planet and influencing our lives. A short explanatory caption and links to sources for more detailed information accompany each illustration.Go to: http://epod.usra.edu/

Looking for a different sort of snack? Iowa State University's Entomology Club has Web pages featuring recipes for Banana Worm Bread, Rootworm Beetle Dip, Chocolate Chirpie Chip Cookies, and other insect treats. A handy nutritional chart reveals that 100 grams of crickets provide 12.9 grams of protein and 5.5 grams of fat whereas June beetles offer roughly the same amount of protein but only 1.4 grams of fat.Go to: http://www.ent.iastate.edu/misc/insectasfood.html

Catch glimpses of people, activities, and projects at the Intel International Science and Engineering Fair, held May 5-11 in San Jose, Calif. A team of students from Mt. Diablo High School in Concord, Calif., created this site as events unfolded at the science fair, from project setup to presentation of the grand awards.Go to: http://science.santacruz.k12.ca.us/isef/isef.ucsc.edu/index.html

An extensive collection of photographs from around the world demonstrate the full weirdness of parasitic plants. For sheer size, try the Rafflesia, with buds the size of footballs and individual flowers that outsprawl a straw hat. For sci-fi charm, visit the fleshy Hydnora blooms reaching out of the dirt or the crusty lumps of Prosopanche fruit. The tropical mistletoes show up as some of the most beautiful, with flashy red, yellow, and orange conflagrations of blooms. The Web site, created by botanist Dan Nickrent of Southern Illinois University at Carbondale, also includes references and supp...

Anthrax has evolved from a disease that farmers sometimes caught from livestock to a potent biological weapon. The Centers for Disease Control and Prevention in Atlanta offers a highly accessible Web site that answers basic questions about transmission, treatment, and prevention of anthrax. The site also provides links to Web pages that explain the biology behind the disease and discuss the controversial anthrax vaccine used by the U.S. military.Go to: http://www.cdc.gov/ncidod/dbmd/diseaseinfo/anthrax_g.htm#currissue/

Created at the National Center for Atmospheric Research, this Web site features middle-school classroom activities with an atmospheric cycles theme. Topics include climate, greenhouse effect, global climate change, and ozone.Go to: http://www.ucar.edu/learn/

For more than a decade, the Hubble Space Telescope has provided astronomers with astonishing views of the universe. This week, the Exploratorium in San Francisco hosts a series of Webcasts from the Space Telescope Science Institute in Baltimore to present a behind-the-scenes peek at how the space telescope is managed. Also check out several collections of spectacular Hubble images.Go to: http://www.exploratorium.edu/hubble/, http://hstexhibit.stsci.edu/, and http://oposite.stsci.edu/pubinfo/