Anti-Ballistic-Missile Systems
The U.S. is now building a "light" ABM system. The authors argue that offensive tactics and cheap penetration aids could nullify the effectiveness of this system and any other visualized so far...
Features
Human Cells and Aging
When normal cells are grown outside the body, their capacity to survive dwindles after a period of time. This deterioration may well represent aging and an ultimate limit to the span of life...
Obsidian and the Origins of Trade
Objects made of this volcanic glass are found at many Neolithic sites around the Mediterranean. Spectroscopic analysis indicates that the raw material often came from hundreds of miles away...
The Automatic Synthesis of Proteins
By anchoring an amino acid to a plastic bead one can add other amino acids one by one in automatically controlled steps. This method has already been used to make the small protein insulin...
Bilingualism and Information Processing
A person who can speak two languages has clearly mastered two sets of symbols. Experiments that cause the two sets to interact provide important clues to how the mind works
Channeling in Crystals
The recent discovery that a beam of charged particles can pass through a crystal lattice in certain directions with surprising case is examined for its theoretical and practical implications...
Pulse-Code Modulation
The growth of communications traffic has enhanced the attractiveness of this method, which converts messages into binary digits that can then be transmitted in the form of closely spaced electrical pulses...
The Adjustable Brain of Hibernators
The unique state of torpor that some mammalian species can attain is the result of a complex chain of events. It now appears that changes in the usual functioning of the brain underlie these events...
Departments
50 and 100 Years Ago: March 1968
Science and the Citizen: March 1968
- Letters
Letters to the Editors, March 1968
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Bibliography
