Issues

Do laboratory studies of friction in a variety of systems have similar behavior?

The number of stars for which we have accurate distances has suddenly grown a hundredfold. It's already affecting estimates of the age of the cosmos.

Thanks to an innovative design, researchers have made an infrared semiconductor laser whose wavelength can be electrically tuned.

Recently released Swedish documents reveal why Lise Meitner, codiscoverer of nuclear fission, did not receive the 1946 physics prize for her theoretical interpretation of the process.

An experiment with squeezed light has demonstrated a new type of nonclassical effect: Correlated two‐photon absorption can produce a two‐photon excited population with a linear intensity dependence.

Information systems play an important role in society, so threats to their security should be taken seriously—but there is no need to panic.