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<jats:p>Scientists have now confirmed a long-held suspicion: Penguins prefer to swim because being both a diver and a flyer is costly and inefficient. And researchers have determined that French King Louis XVI carried genetic risk factors for diabetes, obesity, and bipolar disorder.</jats:p>

<jats:p>In science news around the world, five Asian countries gained observer status to the Arctic Council, the Kepler spacecraft can no longer point in a specified direction, and a new report says that the risk H7N9 avian influenza virus poses to humans is "unusually serious."</jats:p>

<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/340/6135/906.1.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/340/6135/906.2.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/340/6135/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/340/6135/906.3.summary">Random Samples</jats:ext-link> </jats:p> </jats:list-item> </jats:list> </jats:p>

<jats:p>The Institute of Medicine calls into question recommendations advising people to consume less sodium, reviving a passionate debate.</jats:p>

<jats:p>Two researchers who coined the phrase mental time travel, using past memories to construct visions of the future that may never come true, insisted that animals couldn't do it. But now, one of them is changing his tune.</jats:p>

<jats:p>Abundant but mysterious molecules called long noncoding RNAs have long puzzled scientists, but some now think they could be influencing the shape of chromatin.</jats:p>