Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of boiler manufacturer Babcock & Wilcox (NYSE: BWC) rose more than 10% in early trading after the Environmental Protection Agency said it would propose a rule for reducing mercury, lead, and soot in boilers and incinerators.

So what: The EPA and green groups are positioning the rule as a cost-saving measure, claiming it could reduce health-care costs related to harmful emissions. Babcock & Wilcox could benefit as a manufacturer of cleaner boilers, Bloomberg reported.

Now what: If that seems a stretch, you're not alone in thinking that. Babcock & Wilcox's early surge moderated to a mere 1% gain on a day when the Dow Jones Industrial Average (INDEX: ^DJI) rose more than 4%. Where do you stand? Would you buy shares of Babcock & Wilcox at current prices? Please weigh in using the comments box below.

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Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. He didn't own shares in any of the companies mentioned in this article at the time of publication. Check out Tim's portfolio holdings and Foolish writings, or connect with him on Google+ or Twitter, where he goes by @milehighfool. You can also get his insights delivered directly to your RSS reader.

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