Could a drastic restriction on calories extend your lifespan? Hint: It works for fish, flies and monkeys…

Genetic therapy restores sight to blind dogs — a first, large-animal treatment success.

Should human cloning be banned, or restricted? What is the promise of cloning for medical purposes?

Watch a heart transplant from beginning to end, close enough to get your hands wet.

Embryonic stem cells become blood cells in lab experiment, raises hope for eventual treatment.

New hope for stroke victims from radical new therapy. Learning and the adult brain: Does intensive practice really help?

Can embryonic stem cells provide a cure for Parkinson’s and other diseases? Perhaps, but plenty of legal barriers make research difficult. Meet the do-it-all stem cell.

Doctors are learning to persuade the body to grow its own spare parts. Is there hope for the retina, heart or pancreas?

The science of Halloween: bats, brains and cemetaries. Mourn the bats. Earn some interest at the brain bank. Prowl the boneyard!

What is cardiac bypass surgery and how is it done? Want to watch from the head of the operating table?