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<jats:p>Are dolphins as smart as people? And if so, shouldn't we be treating them a bit better? Those were the questions scientists and philosophers debated at a session at the annual meeting of the American Association for the Advancement of Science.</jats:p>

<jats:p>Preliminary findings presented at the annual meeting of the American Association for the Advancement of Science suggest that some proposed techniques to cool the planet manually may have fewer barriers than previously thought.</jats:p>

<jats:p> <jats:italic>Science</jats:italic> reporters posted more than two dozen blog entries and podcasts from the AAAS annual meeting, of which this is a sample. For full coverage, visit <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.sciencenow.org"> <jats:italic>Science</jats:italic> NOW </jats:ext-link> . And to see what our guest bloggers had to say, see <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://news.sciencemag.org/sciencebloggers"> <jats:italic>Science</jats:italic> Bloggers </jats:ext-link> . </jats:p>

<jats:p>Researchers are counting and examining the rare cells shed by a primary tumor that circulate in the blood, but will these studies help patients?</jats:p>

<jats:p> A group at Johns Hopkins University has been monitoring free-floating tumor DNA in blood to track cancer. A new study being published in <jats:italic>Science Translational Medicine</jats:italic> this week suggests that advances in DNA sequencing may make this approach more viable. </jats:p>

<jats:p>Although Mars was once awash in flowing water, all the water found by orbiting radars has long been tied up in recurring ice ages.</jats:p>

<jats:p>Legislators want to shut down the pipeline of “random source” dogs and cats to laboratories, but some researchers worry about the impact on science.</jats:p>