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<jats:title>The Inner Workings of a Clock</jats:title> <jats:p> Eukaryotic circadian clocks are built at least in part on transcriptional feedback loops, but the mechanisms underlying circadian feedback are poorly understood. <jats:bold> Padmanabhan <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="599" related-article-type="in-this-issue" vol="337" xlink:href="10.1126/science.1221592">599</jats:related-article> , published online 5 July) explored the transcriptional feedback mechanism at the heart of the mammalian circadian clock. The proteins PERIOD (PER) and CRYPTOCHROME suppress transcription of their own genes. PER complexes do so in part by recruiting a histone deacetylase to promoters of clock genes. But PER is also present on DNA in a complex with Senataxin, a helicase that functions in transcriptional termination. Senataxin appears to be inhibited in the PER complex, thus inhibiting termination and further reducing the rate of transcription. </jats:p>

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<jats:p>The show includes the quantum mechanics of black holes, analyzing elephant vocalizations, and chasing down the last of the polio virus.</jats:p>

<jats:p>An artist finds beauty in recyclable materials, in turn giving them a new life through photography.</jats:p>