The Census of 1970
The early figures from the 19th count of the U. S. population show a reduced rate of growth, large migrations to the West and South and a continued shift of whites to the suburbs and blacks to cities...
Features
The Induction of Interferon
A synthetic RNA called poly l:C may provide broad-spectrum protection against virus diseases. It makes cells form interferon, the protein that defends other cells against infection by viruses...
A New Class of Diode Lasers
Minute sandwich-like heterostructures composed of two or more different semiconducting materials show great promise as cheap, efficient carrier-wave generators for use in mass communications...
Pathways in The Brain
New techniques combining various staining methods with electron and light microscopy make it possible to investigate in detail the connections among nerve cells and the circuitry of the brain...
The Sacred Source of the Seine
The spring that gives rise to the river was once the sanctuary of Sequana, a Celtic goddess of healing. A unique accumulation of 2,000-year-old wood sculpture has been uncovered at the site...
Supernova Remnants
Radiation emitted by the debris left over from catastrophic stellar explosions may yield clues to many astronomical puzzles
A Grazing Ecosystem in the Serengeti
Large herds of zebras, wildebeests and Thomson's gazelles migrate in succession across the plains of Tanzania. These migrations are synchronized with the availability of specific tissues of grasses...
Photons as Hadrons
Photons with a billion times more energy than photons of visible light exhibit properties once thought to belong solely to hadrons: the class of particles that includes the proton and the neutron...
Departments
50 and 100 Years Ago: July 1971
Science and the Citizen: July 1971
- Letters
Letters to the Editors, July 1971
- Recommended
Books - July 1971
- Mathematical Recreation
Mathematical Games - July 1971
- Amateur Scientist
The Amateur Scientist - July 1971
- Departments
The Authors - July 1971
Bibliography - July 1971
