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Interleukin-2

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

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

Trends in Communications: The Road to the Global Village

By Karen Wright

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

Departments

  • 50 and 100 Years Ago: March 1990

  • Test Negative

  • Polar Heat

  • Vapor Trail

  • Astronomy Potpourri

  • Broadcast Warning

  • Bee Police

  • Who's the Dealer?

  • Down to the Wire

  • Smelling Better

  • Heli-Hopper

  • Fallout

  • Punctuated Equilibrium

  • Safe Passage?

  • Observatories on the Moon

  • New Radioactivities

  • Likely Litigation

  • Not Just a Pretty Face

  • Fischer Black

  • One if by Land

  • One-Step Steel

  • Letters

    Letters to the Editors, March 1990

  • Recommended

    Books, March 1990

  • Mathematical Recreation

    Mathematical Recreations, March 1990

  • Departments

    The Analytical Economist: Changing Money in the East Bloc

  • Essay: Holographic Science to Meet Energy Needs

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March 1990

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