Life's Little Mysteries answers fascinating questions about the world around you and the stuff in it, from things in the news and on your mind to crazy questions you didn't even know you had.
Fluorescent lamps, including compact fluorescent lights, use about 75 percent less energy than incandescent bulbs.
But it's widely believed that these popular bulbs use a lot of energy to start up. Should you just leave them on?
In July 2013, China heralded the opening of its New Century Global Center, an immense 18.9 million square-foot building structure that some are calling the largest building in the world. But is China's mega-structure really the world's biggest building?
The Hum, a steady, droning sound that's heard in places as disparate as Taos, New Mexico, Bristol, England, and Largs, Scotland, affects only a small percentage of the population in those areas. What causes the Hum remains a mystery.