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Observatories on the Moon

Hostile to life, the moon could be a haven for astronomy. Observatories on its surface could yield extraordinarily detailed views of the heavens and open new windows through which to study the universe

By Jack O. Burns, Nebojsa Duric, G. Jeffrey Taylor and Stewart W. Johnson


The first hormone of the immune system to be recognized, it helps the body to mount a defense against microorganisms by triggering the multiplication of only those cells that attack an invader

By Kendall A. Smith

New Radioactivities

An atomic nucleus can spontaneously restructure itself, occasionally ejecting rare clusters of protons and neutrons. Observations of these new radioactivities have illuminated theories of nuclear dynamics

By Walter Greiner and Aurel Sandulescu

Earthquakes in Stable Continental Crust

Earthquakes can strike even in stable crust, well away from the familiar earthquake zones at the edges of tectonic plates. What accounts for these enigmatic events?

By Arch C. Johnston and Lisa R. Kanter

Suspension-Feeding Vertebrates

Animals that filter their food out of the water can reap the abundance of plankton and grow in huge numbers or to enormous size

By Richard Wassersug and S. Laurie Sanderson

Unconscious Mental Functioning

Rigorous, quantitative studies of psychotherapy are challenging certain widely held views of how the unconscious mind works and how patients in therapy make progress

By Joseph Weiss

The Early History of Indo-European Languages

The common ancestor of these languages has been traced to Asia rather than to Europe, the authors say. The once-clear distinction between the family's Eastern and Western branches is now blurred

By Thomas V. Gamkrelidze and V. V. Ivanov


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