The most common form of colorblindness, red-green, affects about 300 million people around the world. But now, several companies are offering glasses that can help those with the condition see colors more distinctly. Every year, a special species of firefly puts on an eye catching, synchronized light show for visitors to the Great Smoky Mountains National Park in Tennessee. It only happens for a couple of weeks. In a different, more technological kind of light show, China just turned on the largest floating solar power plant in the world.