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Dioxin

Concern that this material is harmful to health or the environment may be misplaced. Although it is toxic to certain animals, evidence is lacking that it has any serious long-term effect on human beings

By Fred H. Tschirley

The T Cell and Its Receptor

The cell plays a key role in the body's capacity to fight viral infection, but it also acts to reject grafted tissue. Experiments have now identified the molecule that underlies this behavior

By Philippa Marrack and John Kappler

Quantum Chemical Reactions in the Deep Cold

Quantum-mechanical effects allow some classically forbidden reactions to take place near absolute zero. This suggests that cold, dark clouds of galactic dust could contain seeds of life

By Vitalii I. Goldanskii

Seismic Images of Plate Boundaries

By bouncing sound off rock layers under the sea floor and recording the reflections with many detectors, structural images of the crust can be made at the boundaries where plates collide and rift apart

By John C. Mutter

Reconstructing Bird Phylogeny by Comparing DNA's

Differences between DNA's reveal evolutionary distances between species, making it possible to reconstruct and date the branchings of avian lineages and providing a basis for classifying living groups

By Charles G. Sibley and Jon E. Ahlquist

Inca Stonemasonry

Enormous stone blocks were quarried, shaped and fitted so closely that a knife blade cannot be inserted into the joints. How was it done? To provide answers the author cut stones in an Inca quarry

By Jean-Pierre Protzen

William Herschel and the Making of Modern Astronomy

He discovered thousands of stars and nebulas through telescopes that he himself built. His observations and theories expanded the bounds of astronomy to include the study of objects beyond the solar system

By Michael Hoskin

Departments

  • 50 and 100 Years Ago: February 1986

  • Science and the Citizen, February 1986

  • The Heart as an Endocrine Gland

  • The Amateur Scientist, February 1986

  • Letters

    Letters to the Editors, February 1986

  • Recommended

    Books, February 1986

  • Departments

    The Authors, February 1986

  • Computer Recreations, February 1986

  • Bibliography, February 1986

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February 1986

See the World from a Different Perspective

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