Scientific American Magazine

An analysis of U.S. military forces finds that they so far exceed actual military needs as to be unsafe for the nation and the world. A program for prudently decreasing these forces is here described

Changes in the amount of blood flowing in areas of the human cerebral cortex, reflecting changes in the activity of those areas, are graphically revealed with the aid of a radioactive isotope

Its unexpected discovery as the heaviest particle has prompted physicists to introduce a massive new quark, raising the number of these unobserved elementary subparticles from four to five

For 300 years mathematicians have tried without success to prove a theorem Pierre de Fermat asserted he could prove: No nth power can be the sum of two other nth powers, where n is greater than 2

Isotopes found in a few primitive meteorites are probably debris from a massive star that apparently exploded near the developing solar system about a million years before the meteorites formed

They look so much as if they were intended to be viewed from the air that they have stimulated much vivid speculation. The archaeological evidence indicates who made them and perhaps also why they were made

In the embryo of many organisms the differentiating cells become organized in space by first learning just where they are and then interpreting that information according to their genetic program

Every fall millions of songbirds and small shorebirds leave the east coast of North America for the Caribbean and South America. Their difficult journey has now been followed with the aid of radar