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Features

The "Untouchables" of India

The members of India's lowest castes have traditionally suffered harsh social and economic discrimination. Such discrimination is now prohibited by statute and is slowly beginning to give way

By M. N. Srinivas and André Béteille

The Mechanism of Muscular Contraction

When a muscle contracts, one kind of filament within it slides past another kind. Electron microscopy and other techniques have begun to disclose how the filaments exert a force on each other

By H. E. Huxley

Violations of Symmetry in Physics

Of seven mirrors invented by physicists to describe the symmetry of the laws of nature, three have been shattered. Of those remaining, only one may still be wholly intact. It is called the CPT "mirror"

By Eugene P. Wigner

Fleas

They have evolved some remarkable a adaptations to their hosts. Perhaps the most remarkable is found in the European rabbit flea, the breeding cycle of which is regulated by the reproductive hormones of the rabbit

By Miriam Rothschild

The Aurora

The information gathered by rockets and artificial satellites has contributed to a new physical description of the aurora in which the earth's magnetosphere acts like a gigantic cathode-ray tube

By Syun-Ichi Akasofu

Rheumatic Fever

It is clear that this baffling disease, which often damages the heart, sterns from streptococcal infection. No link has yet been found, however, between the infection and the rheumatic process

By Earl H. Freimer and Maclyn McCarty

Heat Transfer in Plants

Plants, like animals, must regulate their temperature In order to function at optimum physiological efficiency. This is accomplished through three mechanisms: radiation, transpiration and Convection

By David M. Gates

The Physics of the Piano

Most musical instruments produce tones whose partial tones, or overtones, are harmonic: their frequencies are whole-number multiples of a fundamental frequency. The piano is an exception

By E. Donnell Blackham

Departments

  • 50 and 100 Years Ago: December 1965

  • Science and the Citizen: December 1965

  • Letters

    Letters to the Editors, December 1965

  • Recommended

    Books

  • Mathematical Recreation

    Mathematical Games

  • Amateur Scientist

    The Amateur Scientist

  • Departments

    The Authors

  • Annual Index

  • Bibliography

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December 1965

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