Physicist suggests 'quantum foam' may explain away cosmic energy

Most interesting quote:

Carlip suggests instead that in a spacetime foam scenario, energy would exist everywhere in a vacuum—but if you took a much closer look, you would find Planck-sized areas that have an equal likelihood of expanding or contracting. And under such a scenario, the patchwork of tiny areas would appear the same as larger areas in the vacuum—and they would not expand or contract, which means they would have a zero cosmic constant. He notes that under such a scenario, time would have no intrinsic direction.