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GEOLOGY: On the Origins of Granites
John M. Eiler
Science 16 February 2007: 951-952.
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BIOMEDICINE: Every Joint Has a Silver Lining
Gary S. Firestein
Science 16 February 2007: 952-953.
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Review
Applications of Modern Ferroelectrics
J. F. Scott
Science 16 February 2007: 954-959.
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Brevia
Predation Risk Affects Reproductive Physiology and Demography of Elk
Scott Creel, David Christianson, Stewart Liley, and John A. Winnie, Jr.
Science 16 February 2007: 960.
Yellowstone elk have fewer offspring in years in which a predator, the wolf, is more plentiful, demonstrating an indirect cost of antipredator responses.
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Research Article
Pattern Separation in the Dentate Gyrus and CA3 of the Hippocampus
Jill K. Leutgeb, Stefan Leutgeb, May-Britt Moser, and Edvard I. Moser
Science 16 February 2007: 961-966.
Rats code small changes in their surrounding environment by modifying neural activity in the dentate gyrus and code larger differences by activating neurons in an adjacent area.
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Reports
Experimental Realization of Wheeler's Delayed-Choice Gedanken Experiment
Vincent Jacques, E Wu, Frédéric Grosshans, François Treussart, Philippe Grangier, Alain Aspect, and Jean-François Roch
Science 16 February 2007: 966-968.
A realization of Wheeler's delayed choice gedanken experiment with a single photon affirms the wave-particle duality principle of quantum mechanics.
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Multiple Energy Scales at a Quantum Critical Point
P. Gegenwart, T. Westerkamp, C. Krellner, Y. Tokiwa, S. Paschen, C. Geibel, F. Steglich, E. Abrahams, and Q. Si
Science 16 February 2007: 969-971.
Thermodynamic measurements on YbRh2Si2, a heavy fermion metal, at ~0 kelvin, reveal the existence of more than one energy scale and thus a new class of quantum criticality.
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Clustering by Passing Messages Between Data Points
Brendan J. Frey and Delbert Dueck
Science 16 February 2007: 972-976.
Published online 11 January 2007 [DOI: 10.1126/science.1136800] (in Science Express Reports)
An algorithm that exchanges messages about the similarity of pairs of data points speeds identification of representative examples in a complex data set, such as genes in DNA data.
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Reversible Concerted Ligand Substitution at Alternating Metal Sites in an Extended Solid
Darren Bradshaw, John E. Warren, and Matthew J. Rosseinsky
Science 16 February 2007: 977-980.
Guest molecules in a porous metal-organic solid can be substituted reversibly for water at up to one-third of the metal centers, while the remaining metal centers provide support.
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Magmatic and Crustal Differentiation History of Granitic Rocks from Hf-O Isotopes in Zircon
A. I. S. Kemp, C. J. Hawkesworth, G. L. Foster, B. A. Paterson, J. D. Woodhead, J. M. Hergt, C. M. Gray, and M. J. Whitehouse
Science 16 February 2007: 980-983.
Hafnium and oxygen isotopes in zircon crystals imply that common granites form by recycling crustal material in mantle-derived magmas, not by remelting deep crustal rocks.
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Fracture-Controlled Paleo-Fluid Flow in Candor Chasma, Mars
Chris H. Okubo and Alfred S. McEwen
Science 16 February 2007: 983-985.
Bleaching and cementation is seen in fractures and joints that crisscross the layered, sulfate-rich rocks of Candor Chasma on Mars, revealing an ancient hydrologic system.
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Starch Fossils and the Domestication and Dispersal of Chili Peppers (Capsicum spp. L.) in the Americas
Linda Perry, Ruth Dickau, Sonia Zarrillo, Irene Holst, Deborah M. Pearsall, Dolores R. Piperno, Mary Jane Berman, Richard G. Cooke, Kurt Rademaker, Anthony J. Ranere, J. Scott Raymond, Daniel H. Sandweiss, Franz Scaramelli, Kay Tarble, and James A. Zeidler
Science 16 February 2007: 986-988.
Microfossils of starch particles show that chili peppers were used not just as food but to add spice to cuisine by 8000 years ago in the New World, even before the use of pottery.
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