Skip to main content

Features

Agriculture in China

The most populous nation appears to have achieved the objective of producing enough food for all its people. It has done so largely by the adoption of improved strains of rice and wheat

By Sterling Wortman

How the Liver Metabolizes Foreign Substances

Among the most significant of the liver's chemical transformations are the inactivation of drugs, the detoxification of environmental pollutants and the activation of chemicals that can cause cancer

By Alvito P. Alvares and Attallah Kappas

Slavery in Ants

Certain species of ants raid the nests of other species for ants to work in their own nest. Some raiding species have become so specialized that they are no longer capable of feeding themselves

By Edward O. Wilson

Electron-Positron Annihilation and the New Particles

Energetic collisions between electrons and positrons give rise to the unexpected particles discovered last November. They may help to elucidate the structure of more familiar particles

By Sidney D. Drell

Pulsating Stars

A star that varies regularly in brightness is vibrating like the air in an organ pipe. The fundamental vibration or its harmonics are strong clues to the star's composition and internal architecture

By John R. Percy

Visual Motion Perception

The eye has no shutter, and yet a moving world does not appear as a blur. The visual system works not like a camera but more like a computer with a program of specific mathematical rules

By Gunnar Johansson

Pelagic Tar

Fine nets towed in the open ocean pick up ubiquitous black lumps, apparently the residue of sludge washed out of the hold of tankers. The stuff could probably be eliminated by good tanker procedures

By James N. Butler

The Role of Music in Galileo's Experiments

A hitherto unpublished page of Galileo's working notes, preserved in Florence, implies a remarkably simple scheme for equalizing short time intervals. The secret of his success, it now appears, was a song

By Stillman Drake

Departments

  • 50 and 100 Years Ago, June 1975

  • Science and the Citizen, June 1975

  • Letters

    Letters to the Editors, June 1975

  • Recommended

    Books, June 1975

  • Mathematical Recreation

    Mathematical Games, June 1975

  • Amateur Scientist

    The Amateur Scientist, June 1975

  • Departments

    The Authors, June 1975

  • Bibliography, June 1975

Purchase To Read More

Already purchased this issue? Sign In to Access
Select Format
June 1975

See the World from a Different Perspective

Subscribe to Scientific American MIND