An in-depth look at the world of organ and tissue donation.
An alternative source of energy finally takes off. Tom Bearden reports.
A panel discusses President Bush's recent moves on global warming, carbon dioxide and arsenic.
A Congressional hearing explores the possibility of human reproductive cloning. Health correspondent Susan Dentzer reports.
A recent study suggests global warming is altering marine life in Monterey Bay. Spencer Michels reports.
Paleontologist Maeve Leakey talks with Ray Suarez about her recent discovery: a skull three and a half million years old that could provide clues to the ancestors of homo sapiens.
The Russian space station Mir made a fiery return to Earth, crashing down in the South Pacific.
The aging Russian space station Mir fell to earth as scheduled last night. Terence Smith reports.
Two experts discuss President Bush's reversal of a campaign pledge to regulate carbon dioxide emissions from power plants.
Examining new research on and uses for stents -- spring-like devices that keep heart patients' narrowing arteries open. Susan Dentzer reports.
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