Chinese researchers have recently developed a floating hydrovoltaic device that harvests electricity from raindrops.

For years, doctors have relied on familiar vital signs—heart rate, blood pressure, temperature and oxygen levels—to monitor someone's health. But researchers at the University of Missouri believe one ...

We test and rate scores of digital cameras and lenses each year, from pocket-friendly models to high-end medium format systems. Here's everything you need to know to pick the best camera for you.