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<jats:p>A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.</jats:p>

<jats:p>On this week's show: Novae as a source of gamma rays and a roundup of stories from our daily news site.</jats:p>

<jats:title>How to plumb the root is the problem</jats:title> <jats:p> The vascular system of the plant root is generated from four seemingly similar cells. At some point, though, these cells' decendents need to follow different fates. Combining computational modeling with manipulation of hormone signaling in Arabidopsis, De Rybel <jats:italic>et al.</jats:italic> discovered the importance of a small bridge connecting two of the four cells (see the Perspective by Mellor and Bishopp). This feature locked in asymmetry in hormone signaling, so that those cells closest to the xylem delivered the maximal response. Two feedback loops in the model function distinctly, with one generating a domain rich in auxin and the other establishing a sharp boundary between domains. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.1255215">10.1126/science.1255215</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6197" page="622" related-article-type="in-this-issue" vol="345" xlink:href="10.1126/science.1257843">622</jats:related-article> </jats:p>

<jats:p>The importance of energy for development is underscored by the United Nations declaration of 2014 to 2024 as the Decade of Sustainable Energy for All. Among the goals is to provide universal access to electricity and clean cooking. Each laudable in itself, the two goals actually overlap.</jats:p>

<jats:p>A roundup of weekly science policy and related news.</jats:p>

<jats:p>Reanalyzing same data, paper challenges controversial study casting doubt on use of mouse models.</jats:p>

<jats:p>Statistical agencies worldwide are trying to meet demand for cost-savings without harming quality.</jats:p>

<jats:p>Studies of individual animals in the wild suggest that higher cognition has evolutionary trade-offs.</jats:p>

<jats:p> Catalytic approach could eliminate CO <jats:sub>2</jats:sub> emissions from the key step in making fertilizer. </jats:p>