Polymath Roger Penrose takes on the ultimate mystery
Increasingly, experts question the need for land-based missiles
Computers re-create weather of an ancient supercontinent
These pastoralists are key to the future of Kenya's wildlife
"Complexifier" Clifford Geertz ponders anthropology's future
Computer simulations suggest how elliptical galaxies formed
Wall Street is reluctant to back a resurgence of nuclear power
A ban ends, and antisatellite weapons make a comeback
Scientists ponder the role of clouds in climatic change
The discoverer of bat "sonar" thinks about animals' thoughts
U.S. fusion workers chafe under security restrictions
Will fusion-energy reactors be "too complex and costly"?
"Limited" antimissile schemes are gaining in popularity
The supercollider will be built in Texas-if it is built at all
The future for space science looks bright-or does it?
Politicians hear but do not heed scientists' advice on drug abuse
As START stalls, arms controllers focus again on nuclear testing
Electrodes in the brain maysomeday- aid paralysis victims
Do the lessons of the Iranian Airbus tragedy apply to SDI?
Did the U.S. "misrepresent" a key piece of evidence?