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<jats:p> Follow the links below for a roundup of the week's top stories in science, or <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/336/6083/786.1.full.pdf">download a PDF of the entire section</jats:ext-link> . <jats:list list-type="bullet"> <jats:list-item> <jats:p> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/336/6083/786.2.summary">Around the World</jats:ext-link> </jats:p> </jats:list-item> <jats:list-item> <jats:p> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/336/6083/findings.full">Findings</jats:ext-link> </jats:p> </jats:list-item> <jats:list-item> <jats:p> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/336/6083/787.1.summary">Random Samples</jats:ext-link> </jats:p> </jats:list-item> <jats:list-item> <jats:p> <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencemag.org/content/336/6083/787.2.summary">Newsmakers</jats:ext-link> </jats:p> </jats:list-item> </jats:list> </jats:p>

<jats:p>In science news around the world this week, a Senate bill would preserve the U.S. helium supply for research, researchers have issued the first-ever international principles governing peer review of grant proposals, the European Parliament rebuked three regulatory agencies, Norway opened the world's largest carbon capture and storage test facility, and a new Twitter feed run by the Shanghai U.S. consulate is charting the city's air quality.</jats:p>

<jats:p>This week's Newsmaker is Arunava Majumdar, who will leave his post as head of the Department of Energy's Advanced Research Projects Agency-Energy on 9 June.</jats:p>

<jats:p> An analysis of the DNA sequence from three species of <jats:italic>Heliconius</jats:italic> 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. </jats:p>

<jats:p>Last week, Alfred Gilman announced he is stepping down as the chief scientific officer of the Cancer Prevention and Research Institute of Texas this fall because he believes CPRIT's leaders are bypassing scientific review.</jats:p>

<jats:p> A study reported this week in <jats:italic>Science Translational Medicine</jats:italic> of autopsies of four veterans of recent conflicts has found features of the same neurodegenerative disease reported previously in athletes. </jats:p>

<jats:p>On 10 May, the Antiviral Drugs Advisory Committee of the U.S. Food and Drug Administration debated whether an anti-HIV drug should receive approval as a preventive for uninfected people.</jats:p>

<jats:p> Stephen Pruitt is trying to coax states to adopt a set of standards for teaching science in their elementary and secondary schools. He offers a tutorial on the new standards in an interview with <jats:italic>Science</jats:italic> . </jats:p>