Researchers figured out how to generate power from falling raindrops -- which could solve the biggest problem with solar energy

Thomson Reuters Solar panels are generally useless in rainy weather. But researchers in China have found an ingenious solution: They've developed solar panels that can harness the motion of raindrops for energy. It could revolutionize the solar industry. One of the biggest problems plaguing the widespread adoption of solar power is, quite simply, rainy weather. Solar panels are designed to convert sunlight into electricity. But when it's cloudy or rainy, they're rendered useless. There are batte...