Fire and Fire Protection
Fire losses in the U.S. are the highest in the world. The reason is apparently the nation's high standard of living. Better protection calls basically for a better understanding of the mechanism of fire...
Features
The Sex-Attractant Receptor of Moths
The sex attractant of the female silk moth is detected by an array of receptors on the feathery antennae of the male. A nerve impulse in a receptor cell can be triggered by one molecule of attractant...
Hybrid Cells and Human Genes
The mapping of human genes and the study of how they are regulated is facilitated by an experimental substitute for sexual breeding: the fusion of human somatic cells with the cells of other mammals...
Unified Theories of Elementary-Particle Interaction
Physicists now invoke four distinct kinds of interaction, or force, to describe physical phenomena. According to a new theory, two, and perhaps three, of the forces are seen to have an underlying identity...
The Glory
This halo of prismatic colors is most often seen around the shadow of an airplane on a cloud. Its cause is not the same as that of the common rainbow, and involves phenomena at the frontier of physics...
A Family of Protein-Cutting Proteins
The serine proteases act as catalysts in numerous processes, from the digestion of food to the clotting of blood. They have a common mode of action and apparently evolved from a common ancestor...
Sources of Ambiguity in the Prints of Maurits C. Escher
The fascinating graphic inventions of the late Dutch artist reflect a strong mathematical and crystallographic influence. Their original inspiration, however, came from experiments on visual perception...
The Casts of Fossil Hominid Brains
The skulls of man and his precursors can be used as molds to make replicas of the brain. These casts indicate that man's brain began to differ from that of other primates some three million years ago...
Departments
50 and 100 Years Ago, July 1974
Science and the Citizen, July 1974
- Letters
Letters to the Editors, July 1974
- Recommended
Books, July 1974
- Mathematical Recreation
Mathematical Games, July 1974
- Amateur Scientist
The Amateur Scientist, July 1974
- Departments
The Authors, July 1974
Bibliography, July 1974
