How well-meaning donations end up fueling an unproven, virtually unregulated $2 billion stem cell industry.

The hockey legend’s new life as a medical icon for a questionable stem-cell treatment.

The rise of an expensive, experimental stem-cell treatment in China and the medical tourism it attracts.

Many experts believe it’s inevitable that in the coming decades, humans will figure out how to live considerably longer lives. It might not be a good thing.