The Dimensions of World Poverty
Two-thirds of the people in the world live in countries whose annual income per capita is less than $300. The pressing problem is hunger, and under present plans it will remain critical for at least 20 years...
Features
Strong and Ductile Steels
Traditionally the price paid for strength in steel alloys was brittleness. Deeper knowledge of the behavior of solids has led to a class of alloys much tougher than any previously known
The Prevention of "Rhesus" Babies
The problem of Rh incompatibility can now be solved by giving an Rh-negative mother an anti-Rh antibody that inactivates any Rh-positive fetal blood cells that may pass into her circulation...
Visual Illusions
Why do simple figures sometimes appear distorted or ambiguous? Perhaps because the visual system has to make sense of a world in which everyday objects are normally distorted by perspective...
Artificial Plasma Clouds in Space
In which clouds of barium atoms are released by rockets at high altitudes and ionized by solar radiation. These clouds of plasma then interact with electric and magnetic fields around the earth...
A Hunters' Village in Neolithic Turkey
Were the inhabitants of Suberde herdsmen or hunters? The analysis of animal bones at the site shows not only that they were hunters but also that they probably "schlepped" meat home in animal skins...
Transdetermination in Cells
When an embryonic cell begins to differentiate, it is said to be determined for that function. Yet when cells of a fruit-fly larva are transplanted into an adult fly, their determination can change...
The Aerodynamics of Boomerangs
A computer-assisted analysis of the forces that affect the flight path of a boomerang, causing it to return to the thrower, is tested by experiments in the field
Departments
50 and 100 Years Ago: November 1968
Science and the Citizen: November 1968
- Letters
Letters to the Editors, November 1968
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
