Effective submarine-detection systems that do not rely on the vessels'sounds are not likely to emerge soon. Yet possible operating principles are under study, since a functioning system means a military advantage
By Tom Stefanick
Gravity and Antimatter
Newton and Einstein both maintain that an object's gravitational acceleration is independent of its mass and substance. Recent ideas challenge that notion; an antiproton experiment could provide a test
By Michael Martin Nieto, Richard J. Hughes and Terry Goldman
This new class of molecules couples antibodies' vast diversity with the catalytic power that makes enzymes invaluable for technology, medicine and basic research.
By Alfonso Tramontano and Richard A. Lerner
These hoisting machines have diverged into various forms to meet the special needs of urban construction and are indispensable components of the building trade.
By Howard I. Shapiro and Lawrence K. Shapiro
How the Leopard Gets its Spots
A single pattern-formation mechanism could underlie the wide variety of animal coat markings found in nature. Results from the mathematical model open lines of inquiry for the biologist
By James D. Murray
Fatness and Fertility
Loss of fat from dieting or exercise can lead to infertility that is reversible with fat gain. It is possible that fat tissue exerts a regulatory effect on the reproductive ability of human females
By Rose E. Frisch
The Quantum-Effect Device: Tomorrow's Transistor?
The components of ordinary integrated circuits can be made only so small before disruptive effects impair their function. Beyond that size limit a new species of semiconductor device could take over
By Robert T. Bate
The Roman Port of Cosa
At its height in 100 B.C. it included an amphora factory, a winery, a fishery and a water-distribution system as well as a harbor with concrete piers-all controlled by one noble, entrepreneurial family