Absurdly broad stem cell patents are shutting down promising research.
DuPont's energetic chairman is reinventing the nearly 200-year-old chemical company, shifting its emphasis to biology-based materials and electronic displays.
Wireless sensors probe the infrastructure.
The philosophers got it wrong: scientists love new ideas-if they're right.
Medicine: New imagers offer an unprecedented view.
With research on embryonic stem cells mired in controversy, adult stem cells are quietly providing the basis for striking advances toward new therapies.