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Are there CO2 emissions from natural gas?

science.howstuffworks.com/environmental/energy/emissions-natural-gas.htm

Until recently, natural gas was thought of as one of the cleanest fossil fuels. Yet new studies say it may be worse for the ozone layer than coal -- a fuel well-known for its harmful emissions.

How to Maintain a Clean Humidifier

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Winter time often means hauling out the humidifier to improve air quality. But ignoring the cleaning instructions could add to your health problems.

Can We Guess Your Favorite NFL Team?

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By taking a look at how you prepare for a game and who your favorite players of all time are at some key positions, we think we can name the pro team you pull for.

Will Earth Last Forever?

science.howstuffworks.com/will-earth-last-forever.htm

Nothing lasts forever. Does that include our home planet, too?

Is a Woolly Mammoth Clone Even Possible?

science.howstuffworks.com/life/genetic/woolly-mammoth-clone.htm

The woolly mammoth: an iconic extinct species that once roamed the vast arctic tundra during the last ice age. These colossal creatures disappeared thousands of years ago, but now, scientists are working to bring them back.

13 Brown Gemstones for Understated Elegance

science.howstuffworks.com/environmental/earth/geology/brown-gemstones.htm

Looking to add earthy elegance to your jewelry box? Brown gemstones offer a unique and elegant alternative to more traditional colored gemstones.

Are Whales Mammals? Yes, and They're Related to Hippos

animals.howstuffworks.com/mammals/are-whales-mammals.htm

If you've ever wondered, "Are whales mammals?" the answer is a resounding yes. Despite their fish-like appearance, whales belong to the order Cetacea and share many features with other mammals. From breathing air to nursing their young, these marine giants check every mammalian box.

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