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http://www.cbt.virginia.edu/Olh/

How is it that hamsters exercise at the same time every day, even when living in round-the-clock darkness? That's one of the questions the Center for Biological Timing helps budding young scientists answer with its online science experiment web site, which outlines a variety of science-related activities both for middle schoolers and the kindergarten-through-fourth-grade set. Researchers at the center, supported by the National Science Foundation and directed by Vice President for Research and Public Service Gene D. Block, investigate various "biological clocks" and their effects.