Issues

The dimeric bond joins the chemists’ familiar roster of ionic, covalent, hydrogen, and van der Waals.

A new iron-based catalyst is active enough to compete with its expensive rival, but more work is needed to make a viable fuel cell.

Alfvén waves manifest magnetism’s dominance of coronal dynamics. Whether they heat the Sun’s corona remains uncertain.

With academic jobs an early victim of the fiscal slump, many in the rising generation may have little choice but to leave science.

Companies are reducing costs by canceling high-risk R&D projects or moving them to alliances with academia, federal laboratories, and other companies.

US science delegation visits Syria with hope of improving bilateral relations. Similar overtures with Iran suffer a setback.

Public safety is the motivation behind new requirements for becoming certified as a medical physicist.

Sound waves generated by light are the basis of a sensitive medical imaging technique with applications to cancer diagnosis and treatment.

Different parts of a sandpile can exhibit very different dynamical behaviors ranging from jammed to fluid. To understand them, one needs to look at the networks of contacts between individual grains.

The variety of methods by which planets beyond our solar system can be found will lead to the detection and eventual characterization of Earth-size bodies orbiting their stars at hospitable distances.

By exploiting the polarization and wavelength dependence of optical responses, ellipsometers and polarimeters furnish accurate information about interfaces, materials, and even biological systems.