To encourage more people to donate, we need to figure out how location has affected their decision.
Researchers who've created a kidney-on-a-chip explain why these kinds of devices are an improvement over traditional ways to test new drugs.
Most people don't know if they have a hidden extra organ. But they're surprisingly common and often harmless.
Face transplants are one of the great leaps forward of 21st-century medicine. But soon they may not be necessary.