Bomb-detecting plants.

• Position: Science - Brief article

Don't be surprised if five years from now you go through airport security and are told, "Please have your photo ID and boarding pass ready, and walk past the hydrangeas." Scientists at Colorado State University say they've created technology that makes plants subtly change color when they're exposed to small amounts of TNT, the most commonly used explosive. After they detect TNT, the plants' leaves drain off chlorophyll--the stuff that makes them green--and turn white. Plants seem to be uniquely suited by evolution to analyze...