|
April 1993
Scientific American Magazine
Price: $7.95
|
Digital subscribers-sign in for full access
|
|
Cover; April 1993; by Staff Editor; 1 Page(s)
|
|
Masthead; April 1993; by Staff Editor; 1 Page(s)
|
|
Obstacle Course; April 1993; by Marguerite Holloway; 3 Page(s)
Funding and policy stifle
contraceptive research
|
|
Easing a Financial Gag; April 1993; by Marguerite Holloway; 1 Page(s)
For nearly nine years, U.S. aid to family-planning programs was limited by a gag rule: no funds could be administered to any organization that performed abortions or provided counseling on abortions, even if U.S. dollars were not used for those purposes.
|
|
An Eternally Self-Reproducing Cosmos?; April 1993; by John Horgan; 1 Page(s)
Until recently, people obsessed with the fate of the universe could ponder two rather bleak possibilities: either the cosmos keeps expanding forever, its matter dissipating into a cold, black void, or it collapses back onto itself in a cataclysmic "big crunch".
|
|
Flat Chemistry; April 1993; by Russell Ruthen; 1 Page(s)
Enormous polymer sheets
promise unusual properties
|
|
Spot Marks the X; April 1993; by John Rennie; 2 Page(s)
In females, one chromosome
may lock itself inside an RNA
|
|
Kitty, We Shrunk Your Brain; April 1993; by John Rennie; 1 Page(s)
Chelsea Clinton and other cat lovers, don't take this the wrong way, but the brains of your pets aren't all that they used to be.
|
|
Illuminating Zero; April 1993; by Russell Ruthen; 2 Page(s)
Descending toward the
coldest state of matter
|
|
Ancient Sleepers; April 1993; by Philip E. Ross; 1 Page(s)
Some bacteria cheat adverse conditions by folding
themselves into tight, little balls and entering a state
of suspended animation.
|
|
Asteroid Hunters; April 1993; by Corey S. Powell; 2 Page(s)
There's a rock out there with
our name on it. Ho hum.
|
|
The Aging of the Human Species; April 1993; by S. Jay Olshansky, Bruce A. Carnes and Christine K. Cassel; 7 Page(s)
Our species has modified the evolutionary forces that have always limited life expectancy. Policymakers must consequently prepare to meet the needs of a population that will soon be much older
|
|
Cavity Quantum Electrodynamics; April 1993; by Serge Haroche and Jean-Michel Raimond; 8 Page(s)
Atoms and photons in small cavities behave completely unlike
those in free space. Their quirks illustrate some of the principles
of quantum physics and make possible the development of new sensors
|
|
Listening with Two Ears; April 1993; by Masakazu Konishi; 8 Page(s)
Studies of barn owls offer insight into just how the brain combines acoustic signals from two sides of the head into a single spatial perception
|
|
Catalysis on Surfaces; April 1993; by Cynthia M. Friend; 6 Page(s)
Scientists can now observe how solids interact with individual molecules
to speed reactions. Information about these catalysts is being used
to improve everything from materials synthesis to pollution control
|
|
The Reproductive Behavior of the Stickleback; April 1993; by Gerard J. FitzGerald; 6 Page(s)
To reproduce, this tiny fish engages in behaviors
not commonly associated with such animals, including
luring intruders away and cannibalizing another's eggs
|
|
The Evolution of Virulence; April 1993; by Paul W. Ewald; 7 Page(s)
Human behavior appears to influence whether pathogens
evolve into benign or harmful forms. Health policy
should therefore include evolutionary considerations
|
|
Modern Humans in the Levant; April 1993; by Ofer Bar-Yosef and Bernard Vandermeersch; 7 Page(s)
Modern Homo sapiens preceded Neanderthals on Mount Carmel
and followed a similar pattern of life for 60,000 years.
Biology thus cannot explain the cultural revolution that then ensued
|
|
Concrete Solutions; April 1993; by Gary Stix; 9 Page(s)
Rehabilitating the nation's aging infrastructure may depend on how well industry, government and academia tweak the properties of materials, from lowly concrete to aerospace composites
|
|
High Technology; April 1993; by Gary Stix; 2 Page(s)
Will a new venture finally
launch industry into space?
|
|
Advertising Space; April 1993; by Gary Stix; 1 Page(s)
Michael F. Lawson gets his way, a familiar billboard
pitch, "This Space Available," will soon take on new
meaning
|
|
Virtuous Viruses; April 1993; by Tim Beardsley; 2 Page(s)
Agents of disease are being
turned against cancer
|
|
Light Motif; April 1993; by W. Wayt Gibbs; 2 Page(s)
An optical computer stores
its program in space-time
|
|
Putting the Brakes on Tankers; April 1993; by Tim Beardsley; 1 Page(s)
The wreck of the "Braer" off the Shetland Islands in January is the latest in a series of costly calamities caused by oil tankers losing power on
the high seas.
|
|
Global View; April 1993; by Robert Service; 1 Page(s)
A map of the earth that
provides the real picture
|
|
The Analytical Economist; April 1993; by Elizabeth Corcoran and Paul Wallich; 1 Page(s)
Frequent Flaps in the Deregulated Skies
|
|
Book Reviews; April 1993; by Philip Morrison; 3 Page(s)
Living machines...Maya decipherer...Docile Astrid
|
|
Pay for only the issues you want.
Search or browse, make your selections, and checkout.
Update Regarding Subscription and Pay-Per- Issue Accounts
|
