Issues

In the standard model of matter, there are five stages of compositeness—molecules, atoms, nuclei, nucleons, and quarks and leptons—but we are beginning to see regularities at the fifth layer that may point to a deeper, sixth level of structure.

We live on a highly dynamic Earth whose stony outer portion participates in a massive convection of matter that continually builds, destroys and moves plates of continental and oceanic crust.

A former Soviet physicist solves a longstanding mystery about the identities of two Americans who disappeared during the Rosenberg spy case and engaged in technology transfer for the Kremlin

The major climatic effects from nuclear war would come from soot generated by urban fires; much research will be needed to clarify the uncertainties.