Research Articles Mars North Polar Deposits: Stratigraphy, Age, and Geodynamical Response Roger J. Phillips, Maria T. Zuber, Suzanne E. Smrekar, Michael T. Mellon, James W. Head, Kenneth L. Tanaka, Nathaniel E. Putzig, Sarah M. Milkovich, Bruce A. Campbell, Jeffrey J. Plaut, Ali Safaeinili, Roberto Seu, Daniela Biccari, Lynn M. Carter, Giovanni Picardi, Roberto Orosei, P. Surdas Mohit, Essam Heggy, Richard W. Zurek, Anthony F. Egan, Emanuele Giacomoni, Federica Russo, Marco Cutigni, Elena Pettinelli, John W. Holt, Carl J. Leuschen, and Lucia Marinangeli http://www.sciencemag.org/cgi/content/abstract/320/5880/1182 p. 1182 Widespread Translational Inhibition by Plant miRNAs and siRNAs Peter Brodersen, Lali Sakvarelidze-Achard, Marianne Bruun-Rasmussen, Patrice Dunoyer, Yoshiharu Y. Yamamoto, Leslie Sieburth, and Olivier Voinnet http://www.sciencemag.org/cgi/content/abstract/320/5880/1185 p. 1185 Predicting Human Brain Activity Associated with the Meanings of Nouns Tom M. Mitchell, Svetlana V. Shinkareva, Andrew Carlson, Kai-Min Chang, Vicente L. Malave, Robert A. Mason, and Marcel Adam Just http://www.sciencemag.org/cgi/content/abstract/320/5880/1191 p. 1191 Brevia Ecosystem Feedbacks and Nitrogen Fixation in Boreal Forests Thomas H. DeLuca, Olle Zackrisson, Michael J. Gundale, and Marie-Charlotte Nilsson http://www.sciencemag.org/cgi/content/abstract/320/5880/1181 p. 1181 Reports The Cassiopeia A Supernova Was of Type IIb Oliver Krause, Stephan M. Birkmann, Tomonori Usuda, Takashi Hattori, Miwa Goto, George H. Rieke, and Karl A. Misselt http://www.sciencemag.org/cgi/content/abstract/320/5880/1195 p. 1195 Interfacial Polygonal Nanopatterning of Stable Microbubbles Emilie Dressaire, Rodney Bee, David C. Bell, Alex Lips, and Howard A. Stone http://www.sciencemag.org/cgi/content/abstract/320/5880/1198 p. 1198 The Sensitivity of Polar Ozone Depletion to Proposed Geoengineering Schemes Simone Tilmes, Rolf Müller, and Ross Salawitch http://www.sciencemag.org/cgi/content/abstract/320/5880/1201 p. 1201 Water Activity and the Challenge for Life on Early Mars Nicholas J. Tosca, Andrew H. Knoll, and Scott M. McLennan http://www.sciencemag.org/cgi/content/abstract/320/5880/1204 p. 1204 A Cytosolic Iron Chaperone That Delivers Iron to Ferritin Haifeng Shi, Krisztina Z. Bencze, Timothy L. Stemmler, and Caroline C. Philpott http://www.sciencemag.org/cgi/content/abstract/320/5880/1207 p. 1207 Massive Horizontal Gene Transfer in Bdelloid Rotifers Eugene A. Gladyshev, Matthew Meselson, and Irina R. Arkhipova http://www.sciencemag.org/cgi/content/abstract/320/5880/1210 p. 1210 Ancestral Monogamy Shows Kin Selection Is Key to the Evolution of Eusociality William O. H. Hughes, Benjamin P. Oldroyd, Madeleine Beekman, and Francis L. W. Ratnieks http://www.sciencemag.org/cgi/content/abstract/320/5880/1213 p. 1213 Log or Linear? Distinct Intuitions of the Number Scale in Western and Amazonian Indigene Cultures Stanislas Dehaene, Véronique Izard, Elizabeth Spelke, and Pierre Pica http://www.sciencemag.org/cgi/content/abstract/320/5880/1217 p. 1217 Coordination of Early Protective Immunity to Viral Infection by Regulatory T Cells Jennifer M. Lund, Lianne Hsing, Thuy T. Pham, and Alexander Y. Rudensky http://www.sciencemag.org/cgi/content/abstract/320/5880/1220 p. 1220 MeCP2, a Key Contributor to Neurological Disease, Activates and Represses Transcription Maria Chahrour, Sung Yun Jung, Chad Shaw, Xiaobo Zhou, Stephen T. C. Wong, Jun Qin, and Huda Y. Zoghbi http://www.sciencemag.org/cgi/content/abstract/320/5880/1224 p. 1224 Technical Comments -------------------- Comment on "Mixed-Layer Deepening During Heinrich Events: A Multi-Planktonic Foraminiferal {delta}18O Approach" Claude Hillaire-Marcel and Anne de Vernal http://www.sciencemag.org/cgi/content/abstract/320/5880/1161a p. 1161 Response to Comment on "Mixed-Layer Deepening During Heinrich Events: A Multi-Planktonic Foraminiferal {delta}18O Approach" Harunur Rashid and Edward A. Boyle http://www.sciencemag.org/cgi/content/abstract/320/5880/1161b p. 1161 --

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