Most people are cautious around gasoline and diesel for good reason, but some microbes love the stuff—especially biofuels that contain fatty acid derivatives. So, as the world tries to go “green,” it also has to consider the slime that such microbes leave behind, clogging up equipment and killing engines. An article in Chemical & Engineering News (C&EN), the weekly newsmagazine of the American Chemical Society explores the issue and what’s being done about it.