Scientific American Magazine

It is a recurrent and often devastating feature of the sub-Saharan climate. If leaders were to treat it as recurrent, they could deal with it in ways that would stabilize the region's far m production

Spectroscopy, X-ray crystallography and molecular genetics combine to give a detailed picture of events in photosynthesis and show how particular molecules contribute to the process

Einstein's general theory of relativity suggests that the earth is bathed with gravitational waves from distant stars. Observatories planned for the early 1990's could detect the extragalactic signals

An inquiry into the roots of human amnesia has shown how deep structures in the brain may interact with perceptual pathways in outer brain layers to transform sensory stimuli into memories

In the life cycle of many volcanoes a catastrophic collapse is a "normal" event. The details of the process are revealed in the deposits left by the devastating avalanches of debris

Collapsible lungs and a spleen that functions as a scuba tank are apparently among the features that enable the seal to swim deeper, and to hold its breath longer, than most other mammals

Most computers have a single processing unit. In this new parallel computer 65,536 processors work on a problem at once. The resulting speed may transform several fields, including artificial intelligence

Recently declassified Government files reveal the events that led to research on biological weapons. Now a divisive public issue, the program started out as an obscure operation in World War II