I think the problem is that you interpreted the headline as meaning it could convert all waste heat to work. This is, of course, impossible. Converting some of

I think the problem is that you interpreted the headline as meaning it could convert all waste heat to work. This is, of course, impossible. Converting some of the waste heat to work is entirely possible. When there's two possible interpretations of a headline, and one of them is physically possible and the other one violates the second law of thermodynamics... it's probably best to assume the former. At least until you read the article.