Before I make my post, I'd just like to introduce myself. My nickname is quantum_foam, as you can see (it's from the book Timeline by Michael Crichton). I consider myself a novice at best when it comes to the various areas of physics. I am especially interested in quantum physics, but most of it is quite confusing to me. Anyway, let me continue my post. http://physicsweb.org/article/news/4/7/8/1 I read about this experiment about a year ago, and I found it quite interesting to say the least. To me, the idea that the pulse of light existed the cesium cell BEFORE it had even entered was both defying my logic and intruiging at the same time. I have two questions for all of you: 1. I haven't been able to find an explanation for how exactly the pulse of light exited before it entered. Do any of you know why this happens, or is it not quite known even by scientists? If you do know why this happens, I would appreciate any explanation you could give. 2. Do you believe that this experiment actually proves that the speed of light is either infinite, or that it is a greater speed than what is generally accepted today? Thank you in advance for any and all information you can provide me. I'll probably be asking you questions about some points made in your responses, so please bear with my ignorance, as I am wholeheatedly interested in expanding my knowledge in physics (especially quantum physics).