Clearing the Air in Los Angeles
Although Los Angeles has the most polluted skies in the nation, it is one of the few cities where air quality has improved in recent decades
Features
Large Igneous Provinces
These vast fields of lava record powerful but geologically brief pulses of magmatic activity. Their formation may have triggered significant changes in the global environment
Evolutionarily Mobile Modules in Proteins
Many proteins consist of a fairly small set of modular elements. How these units spread and multiplied during evolution is not altogether clear, but a pattern may be emerging
Electrorheological Fluids
Some liquids solidify instantly when exposed to an electric field. Such protean materials may give engineers quicker, more adaptive machines
Water-Pollinated Plants
Once thought to be mere aberrations of nature, these flowering aquatic species provide evidence for the evolutionary convergence toward efficient pollination strategies
Simulating Brain Damage
Adults with brain damage make some bizarre errors when reading words. If a network of simulated neurons is trained to read and then is damaged, it produces strikingly similar behavior...
Raising the Vasa
This Swedish man-of-war foundered on her maiden voyage and slept for three centuries at the bottom of Stockholm Harbor. Here is the story of her resurrection
The Death of Proof
Computers are transforming the way mathematicians discover, prove and communicate ideas, but is there a place for absolute certainty in this brave new world?
Departments
- Letters
Letters to the Editors, October 1993
- The Science Agenda
Magnetic Apprehensions
- Recommended
Book Reviews--The Demographic Transition
- 50, 100 & 150 Years Ago
50 and 100 Years Ago: Isolating Proteins and Seeing in the Dark
- Amateur Scientist
Making Fluids into Solids with Magnets
- Science and the Citizen
Hard Times
Sentries and Saboteurs
Creative Evolution
Never Give a Sucker an Even Break
Sharks do get Cancer
Run Silent, Run (Not So) Cheap
Jurassic Virus?
- Departments
A Digital Fix for the Third World?
Tadpoles from Heaven
- Technology and Business
CRADA Mania
A Wand for the Meter Reader
Mag Lift
Chronologically Privileged
Power Pack
