Issues

The Pentagon is touting prospects, based on hotly disputed experiments, for a novel class of weapons intermediate between chemical high explosives and fission weapons

Aerosols, such as smoke, help clouds to form by acting as nucleation sites for water droplets. But that’s not the only way aerosols influence clouds

In permitting one scholarly publisher’s activities, the Treasury Department seems to have muddied the dispute over freedom of the press and, in addition, has warned against collaborations between US scientists and their colleagues in sanctioned countries

White House rebuttal fails to persuade many in the science community

The realization that light beams can have quantized orbital angular momentum in addition to spin angular momentum has led, in recent years, to novel experiments in quantum mechanics and new methods for manipulating microparticles

Low-temperature techniques often bring to mind cryogenic liquids, gas compressors, and massive installations. But researchers are now building refrigerators and sensors that work by controlling electrons on a silicon chip

Nonequilibrium systems come in many varieties, and a number of not-yet-reconciled mathematical approaches can be applied to them