Issues

Two scientists at the General Motors Research Laboratories have developed a way to predict the probability and severity of impact injuries in the body's soft tissues, including the heart, liver, and the central nervous system. It is an essential step in designing safety systems to reduce such injuries.

Some grand unified theories require that stringy exotic matter from the very early universe persist to the present, with astrophysically observable consequences.

Mineralogical data and comparative planetology suggest a controversial hypothesis—that much of the Earth's crust may be buried within the mantle.

In addition to confirming Maxwell's electromagnetic theory. Hertz's experimental and theoretical work one hundred years ago helped lay the foundation for quantum theory and relativity.