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  1. Math

    Counting Franklin’s Magic Squares

    Benjamin Franklin's remarkable magic squares are just three of more than 1 million possibilities. For more math, visit the MathTrek blog.

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  2. Humans

    From the June 20, 1936, issue

    A lightning portrait, the effects of cosmic rays, and helium to prevent the bends.

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  3. Humans

    Visible Proofs

    This dramatic Web site from the U.S. National Library of Medicine unveils the world of forensic medicine, anthropology, technology, and history. The site includes information on significant cases, various technologies, and other topics. It also has three online activities and three lesson plans. Go to: http://www.nlm.nih.gov/visibleproofs/index.html

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  4. Paleontology

    Sticky Subjects: Insights into ancient spider diet, kinship

    Remnants of a spider web embedded in ancient amber suggest that some spiders' diets haven't changed much in millions of years.