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Karen Hopkin is a freelance science writer in Somerville, Mass. She holds a doctorate in biochemistry and is a contributor to 大众科学's 60-Second Science podcasts.

More by Karen Hopkin
大众科学 Magazine Vol 278 Issue 4This article was originally published with the title “Clock Setting” in 大众科学 Magazine Vol. 278 No. 4 (), p. 20
doi:10.1038/scientificamerican0498-20
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