A strange bacterium renders noxious pollutants harmless. A spacecraft provides the closest look yet at an asteroid. Under President Clinton's command, researchers step up the search for an HIV vaccine. A supercomputer anticipates the catastrophic impact of a giant comet. IBM's silicon powerhouse plays a rematch with the world's chess champ.
Forensic entomology helps send poachers to jail.
A new exhibit makes the case for the value of biodiversity. A study of journal publications details investigators' financial interests in their research. A sheep cloned from adult cells opens vast scientific possibilities and ethical dilemmas. A satellite observes the lightning-fast flickerings of cosmic objects. An unusual concentration of science fact graces the silver screen.