Skip to main content

Features

The International Control of Disarmament

The widely acknowledged need for a separate United Nations agency-responsible for verifying and controlling disarmament agreements is intensified by the current impasse In bilateral "summit" talks

By Alva Myrdal

The Structure of Emission Nebulas

An emission nebula is a cloud of interstellar gas that shines by its own light. Each kind of ion in it has a characteristic color, and three-color photography reveals how the ions are distributed

By Joseph S. Miller

How Cilia Move

The hairlike organelles that propel swimming cells or move liquids over fixed cells are composed of sheaves of nlicrotubules. The cilia beat when the microtubules, powered by ATP, slide past one another

By Peter Satir

Nitrogen Fixation

Life requires nitrogen that has been "fixed" through combination with other elements. Thermodynamics imposes a constraint on all possible methods of fixation: invariably energy must be supplied

By David R. Safrany

The Dimensions of Stairs

From antiquity to modern times stairways have been built by rules of thumb. A study of how people move and expend energy in going up and downstairs suggests a more rational approach to their design

By James Marston Fitch, John Templer and Paul Corcoran

Mimicry in Parasitic Birds

Various species of birds lay their eggs In the nest of another bird, which then incubates the eggs and feeds the young. The widow birds of Africa achieve this result by some remarkable feats of mimicry

By Jürgen Nicolai

The Coordination of Eye-Head Movements

The sequence of events in the nervous system that coordinates the movements of the eyes and the head in firating a visual target has been clarified by recent experiments with monkeys

By Emilio Bizzi

The Excavation of a Drowned Greek Temple

Geological changes in the level of the Mediterranean shoreline have sublnerged a number of classical sites. The investigation of one of these shallow-water ruins suggests that they would all reward study

By Michael H. Jameson

Departments

  • 50 and 100 Years Ago, October 1974

  • Science and the Citizen, October 1974

  • Letters

    Letters to the Editors, October 1974

  • Recommended

    Books, October 1974

  • Mathematical Recreation

    Mathematical Games, October 1974

  • Amateur Scientist

    The Amateur Scientist, October 1974

  • Departments

    The Authors, October 1974

  • Bibliography, October 1974

Purchase To Read More

Already purchased this issue? Sign In to Access
Select Format
October 1974

See the World from a Different Perspective

Subscribe to Scientific American MIND