Issues

The Milky Way’s nearby twin is a good place to look for evidence of how galaxies form.

An array of semiconducting nanowires can absorb nearly as much light as a thin film but at lower cost.

Manipulating those signals in just the right way may have applications in regenerative and cancer medicine.

Signals from high-energy physics communities in other regions are key to Japan’s going forward with a proposal to host the particle accelerator.

Massive open online courses promise a convenient, low-cost experience, but high dropout rates threaten to slow their growth.

The DOE hub is set to be the largest R&D effort toward alleviating the global shortage of rare-earth metals.

New requirements in 2014 will formalize the controls on radiological sources that have been implemented since the 11 September 2001 terrorist attacks.

In loop quantum gravity, spacetime emerges from excitations of an ultimate vacuum.

The consequences, for good and ill, of that annus mirabilis of discovery and invention are still very much with us.

Sensitive experiments with low-energy neutrons are helping to unravel mysteries of cosmology, gravitation, and the standard model of particle physics.

Atom-trap trace analysis can reliably detect age-revealing noble-gas isotopes whose isotopic abundances are as low as 1 part in 10¹⁶.