Medical Treatments

An Iraq war veteran has developed a better artificial leg with a cooling fan. Gary Walters says most prosthesis don't release heat, causing many amputees to stop wearing them.

The U.S. government has stopped some experiments with dangerous viruses, saying the risks need to be reconsidered. Key work in one scientist's lab has been halted.

Scientists in England are ready to do something that's never been done before — combine the DNA of two women and one man to create embryos that don't carry hereditary mitochondrial disorders.

Research shows that simple changes in drinking habits can help people who've had kidney stones lower the odds that they'll strike again. Consuming plenty of fiber may make a difference, too.

In writing her new book On Immunity, Eula Biss found that questions about vaccination touch on attitudes about environmentalism, citizenship and trust in the government.