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Science  18 May 2012:
Vol. 336, Issue 6083, pp. 787-788
DOI: 10.1126/science.336.6083.787-a

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Summary

An analysis of the DNA sequence from three species of Heliconius butterflies and several subspecies reveals that those with the same color patterns have the same versions of key genes, holdovers from extensive hybridization within the genus. A recent master's degree thesis at European University Viadrina Frankfurt (Oder) in Germany is generating waves—though not the "time waves" the student was looking for. And this week's numbers quantify deaths of children under 5 caused by preventable infectious diseases, U.S. adults who sleepwalk, and pages in the Encyclopedia of Life.