The Ecological Effects of Radiation
Ecosystems, the basic biological units of man's environment, are altered significantly by ionizing radiation. Forests appear to be among the most sensitive systems; weed fields are more resistant...
Features
Noctilucent Clouds
These mysterious "night-shining clouds" that occur 50 miles up are seen occasionally in summer at high latitudes. Last August rocket-borne collectors brought back samples of their substance...
Kilomegacycle Ultrasonics
"Ultrasonics" usually means acoustic frequencies up to a billion Waves of cycles per second: one kilomegacycle. Waves of higher frequency interact with matter and other forms of energy in intriguing ways...
The Lymphatic System
This second circulation plays an essential role in maintaining the body's steady state, draining from the spaces between cells fluid, protein and other substances that leak out of the blood...
Hydrogen in Galaxies
Recent studies with radio telescopes indicate that the amount of interstellar hydrogen in a galaxy is correlated with its structural type and holds clues to its origin and evolution
The Sanctuary of Artemis at Brauron
Recent excavations have uncovered the holy place where the women of Greece sought the favor of the goddess in childbirth. The site has also provided evidence on the early political history of Greece...
Machine Translation of Chinese
Although perfect translation is known to be unattainable, good progress has been made in translating Chinese with a machine that has high-speed access to a linguistic "library".
Early Experience and Emotional Development
Experiments with infant rats demonstrate the decisive influence of early social experiences on later emotional behavior. Some reciprocal effects of the mother-infant relation are also examined...
Departments
50 and 100 Years Ago: June 1963
Science and the Citizen, June 1963
- Letters
Letters to the Editors, June 1963
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
