When Kim and I set off to write a book about light, we did so because we thought it was a fascinating subject that seemed greatly underappreciated. In fact, one of the themes of our book is that light is found everywhere in a multitude of forms and does an amazing variety of things. And the technology used to harness and understand light can spread into our lives in unforeseen ways. Take, for instance, this result just announced in a press release by the University of Illinoi
Light might seem like a simple concept. We wake up every morning, and sooner or later the Sun rises and things get "light." Or, we walk into a dark house and flick a switch and where there was once darkness, there is now light. But what exactly is light? Despite being 93 million miles from the Earth, the Sun delivers approximately 5 trillion giga-joules of energy to the Earth's surface every year. Credit: NASA/JSC Light is so much more than the “either/or” of illumination.