The Service Sector of the U.S. Economy
It is now the dominant sector, replacing the goods-producing sectors. Other changes are the growth of the nonproht sector, the increase in human capital and the further internationalization of the economy...
Features
The Ground Substance of the Living Cell
The high resolution that has been achieved with the high-voltage electron microscope reveals the microtrabecular lattice: a system of gossamer filaments that support and move the cell organelles...
The Eruptions of Mount St. Helens
The volcano's current cycle of activity is part of a pattern extending over 4,500 years. Indeed, its violent eruptions of last year were predicted by volcanologists on the scene
The Milky Way Galaxy
A few years ago the fundamental facts about it seemed to be fairly well established. Now even its mass and its radius have come into question
Submarine Pollination
The sea grasses, flowering below the ocean surface, must shed and capture pollen in an underwater habitat. What are the differences between their system of reproduction and that of land-based plants?...
Anorthoscopic Perception
A figure revealed one section at a time through a narrow slit may be perceived in its entirety. Is this effect based on the painting of the image over the retina or on deeper psychological events?...
The Biochemistry of Resistance to Malaria
Genes for two lethal diseases, sickle-cell anemia and thalassenlia, are favored by evolution because they protect against malaria. Now the mechanisms of that protection can be studied in the laboratory...
Newton's Discovery of Gravity
How did he come to develop the concept that marked the beginning of modern science? In essence he did so by repetitively comparing the real world with a simplified mathematical representation of it...
Departments
Science and the Citizen, March 1981
- Letters
Letters to the Editors, March 1981
- Recommended
Books, March 1981
- 50, 100 & 150 Years Ago
50 and 100 Years Ago, March 1981
- Amateur Scientist
The Amateur Scientist, March 1981
- Departments
The Authors, March 1981
Metamagical Themas, March 1981
Bibliography, March 1981
