Well, they didn't create something from nothing; energy is still something. Einstein already theorized that matter could be turned into energy and was proved correct; it isn't a stretch that energy could be turned into matter. It does take an enormous amount of energy however, which is why it couldn't be done before.
So, don't worry, people, entropy is still intact, we won't die in a universe-spanning explosion any time soon.
Unless trump wins. All bets are off, then.