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cover: Microscopic crystals of magnetite—the most strongly magnetic mineral in nature—are the dominant carriers of remanent magnetization in rocks. A transmission electron microscopy technique known as electron holography can reveal the complexity of that magnetization, as shown in this half-micron-wide image. Arrows indicate the direction of the magnetic field component parallel to the sample’s surface; magnetite-rich regions are outlined in white. For details and the broader story of using a rock’s magnetic memory to discern aspects of planetary history, see the article by David Dunlop on page 31. (Image courtesy of Richard Harrison, University of Cambridge.)

Articles

Select this Article FREE		Magnetic recording in rocks David J. Dunlop


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	+ -	Show Topic Charting the movement of tectonic plates or the evolution of a dynamo ultimately relies on the behavior of often imperfect mineral grains in Earth’s magnetic field.

Select this Article FREE		Teaching general relativity to undergraduates Nelson Christensen and Thomas Moore


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	+ -	Show Topic Inspired by new results in cosmology and astrophysics, undergraduates are increasingly eager to learn about general relativity. A number of innovative textbooks make it easier than ever before to satisfy that demand.

Select this Article FREE		Physics resources for varied communities Catherine O’Riordan


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	+ -	Show Topic Through manifold partnerships, the Physics Resources Center at the American Institute of Physics serves scientific societies, the public, and individuals, including researchers, students, journalists, and administrators.

Readers' Forum

Commentary: What defines a healthy US particle-physics program?

Select this Article FREE		Commentary: What defines a healthy US particle-physics program? Persis S. Drell


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Politics and humility in climate change debate

Select this Article FREE		Politics and humility in climate change debate Terrance J. Goldman


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Select this Article FREE		Politics and humility in climate change debate Robert J. L. Thompson


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Select this Article FREE		Politics and humility in climate change debate John W. Cooper


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Select this Article FREE		Politics and humility in climate change debate Frank Chen


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Boundary conditions and Maxwell’s equations

Select this Article FREE		Boundary conditions and Maxwell’s equations Jean C. Piquette


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Select this Article FREE		Boundary conditions and Maxwell’s equations Thomas Baumgarte and Stuart Shapiro


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Sexism may be in the eye of the beholder

Select this Article FREE		Sexism may be in the eye of the beholder Richard Wolfson


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Select this Article FREE		Sexism may be in the eye of the beholder Leon Lederman and Christopher Hill


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Nature’s manifest absurdity: A cautionary tale

Select this Article FREE		Nature’s manifest absurdity: A cautionary tale Michael Nauenberg


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Select this Article FREE		Nature’s manifest absurdity: A cautionary tale Alan Chodos


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A note on rocky planet formation

Select this Article FREE		A note on rocky planet formation Ben Zuckerman


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Coherence and precision in classical systems

Select this Article FREE		Coherence and precision in classical systems Spencer Klein


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Select this Article FREE		Coherence and precision in classical systems Rob Sewell and Morgan Mitchell


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Correction

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Search and Discovery

Select this Article		Evidence for Majorana fermions in a nanowire R. Mark Wilson


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	+ -	Show Topic Electrical conductance measurements reveal what may be massless, chargeless, and spinless quasiparticles of zero energy.

Select this Article		Carbon dioxide drove the ending of the last glacial epoch Bertram M. Schwarzschild


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	+ -	Show Topic A worldwide assemby of proxy paleothermometers has addressed the disputed role of greenhouse gases in periodic deglaciations.

Select this Article		Classical vortex beams show their discrete side Ashley G. Smart


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	+ -	Show Topic Researchers twist sound, testing a fundamental law of the quantization of orbital angular momentum.

Select this Article		Time to reset isotopic clocks? Johanna L. Miller


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	+ -	Show Topic Two new studies revise key parameters in radiometric dating.

Select this Article		DNA-based sensors know what the nose knows Johanna L. Miller


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	+ -	Show Topic The sensors can “smell” the difference between similar molecules.

Physics Update

Select this Article		IceCube fails to see neutrinos from gamma-ray bursts Steven K. Blau


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Select this Article		Entangled two-spin qubits Richard J. Fitzgerald


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Select this Article		Doppler sonar in air for border security Stephen G. Benka


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Select this Article		Modeling the impact on Hawaii of the 2011 tsunami Charles Day


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Select this Article		Building a virus the simple way Ashley G. Smart


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Issues and Events

Select this Article		Progress in fusion, but not in its US funding Toni Feder


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	+ -	Show Topic Although some countries are, like the US, struggling with funding, they are forging ahead with fusion—especially in Asia.

Select this Article FREE		Stove designed by US national lab improves lives in Darfur David Kramer


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	+ -	Show Topic In cutting the wood fuel requirement in half, the stove also reduces Darfuri women’s exposure to violence.

Select this Article FREE		White House, Congress mull future of scientific journals David Kramer


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Select this Article		Jupiter mission selection garners excitement, questions Toni Feder


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Select this Article		Max Planck pushes frontiers around globe Toni Feder


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News notes

Select this Article		Antarctic telescope Toni Feder


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Select this Article		Physics faculty jobs Toni Feder


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Books

Select this Article FREE		The Hockey Stick and the Climate Wars: Dispatches from the Front Lines Naomi Oreskes, Reviewer


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Select this Article FREE		The Rise of Nuclear Fear Michael D. Gordin, Reviewer


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Select this Article FREE		Principles of Multiscale Modeling Nicholas Kevlahan, Reviewer


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Select this Article FREE		The Sun’s Heartbeat: And Other Stories from the Life of the Star That Powers Our Planet Dibyendu Nandi, Reviewer


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Select this Article FREE		New books


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New Products

Select this Article FREE		Focus on sensors and detectors Andreas Mandelis


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Obituaries

Select this Article FREE		Philip Moss Platzman D. R. Hamann and Eric D. Isaacs


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Select this Article FREE		David Sayre Janos Kirz, Chris Jacobsen, and Jianwei Miao


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Select this Article FREE		Norbert Untersteiner John S. Wettlaufer


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Quick Study

Select this Article		From black holes to strange metals Hong Liu


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	+ -	Show Topic String theory relates gravity to the physics of a novel phase of matter observed above the superconducting transition temperature.