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Features

The Foreign Medical Graduate

A third of the physicians now beginning their career in the U.S. received their education abroad. This substantial proportion reflects underlying flaws in the American system of delivering health care

By Stephen S. Mick

Computer-Managed Parts Manufacture

Although a completely automatic factory still lies in the future, important advances have been made in fully automatic systems for the batch manufacture of a variety of complex components

By Nathan H. Cook

The Most Primitive Objects in the Solar System

Minerals found in the meteorites known as carbonaceous chondrites represent samples of the solid grains that condensed directly out of the gaseous nebula that gave birth to the sun and the planets

By Lawrence Grossman

Chromosomal Proteins and Gene Regulation

The role of the proteins associated,with DNA in the nuclei of higher organisms is beginning to be understood. Apparently the histones keep genes turned off and the nonhistone proteins selectively turn them on

By Gary S. Stein, Janet Swinehart Stein and Lewis J. Kleinsmith

Dual-Resonance Models of Elementary Particles

In this new theoretical approach the strongly interacting particles classified as hadrons are viewed mathematically as massless strings whose ends move with the speed of light in multidimensional space

By John H. Schwarz

Biological Clocks of the Tidal Zone

Endogenous clocks set to the rhythm of the solar day are known throughout the biological world. Many organisms that live along the shore also have a clock set to the rhythm of the lunar day

By John D. Palmer

A Carthaginian Fortress in Sardinia

Before her fatal clash with Rome, Carthage dominated the western Mediterranean. A strongpoint on Monte Sirai in Sardinia emerges as part of a network with which she controlled the entire island

By Sabatino Moscati

Alfred Wegener and the Hypothesis of Continental Drift

Sixty years ago a German scientist argued that the continents move, and he proposed a history of their migrations. The validity of his theory was not recognized until new evidence emerged in the 1960's

By A. Hallam

Departments

  • 50 and 100 Years Ago, February 1975

  • Science and the Citizen, February 1975

  • Letters

    Letters to the Editors, February 1975

  • Recommended

    Books, February 1975

  • Mathematical Recreation

    Mathematical Games, February 1975

  • Amateur Scientist

    The Amateur Scientist, February 1975

  • Departments

    The Authors, February 1975

  • Bibliography, February 1975

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February 1975

Think Outside the Gift Box