British physicist Stephen Hawking says a computer virus fits the definition of a living system even though it has no metabolism of its own, and instead uses the metabolism of a host computer for its parasitic existence. "I think computer viruses should count as life. I think it says something about human nature that the only form of life we have created so far is purely destructive. We've created life in our own image," says Hawking. (St. Petersburg Times 8/8/94 p.8). He is referring to the way humans spread on our planet like viruses do.