I've just seen tonight's episode of "Through the Wormhole with Morgan Freeman", which dealt with empty space and the concept of nothingness at the level of quantum mechanics. Although it death with many interesting ideas and observations it overlooked the most obvious fact about "empty" space, that being the fact that it consists of the dimensions of space-time, which are bent by the gravitation permeating the universe. While we've observed gravitation warping space-time in the proximity of masses, and proportionally thereto, we must recognize that what is being warped are not the masses themselves, but the very dimensions of space-time. So, forget that "empty" space is full of photons, particles, molecules, and even gravitons. "Empty" space is full of dimensions, expanding faster than the speed of light, and subject to warping (and twisting) by gravitation. I guess what I'm really saying s that space itself is a thing, a tangible, malleable object. Therefore there is nowhere in the universe where nothingness exists.