 The Green Lantern In the grand scheme of things, a hot shower represents just a fraction of your overall water and energy usage. But cranking up the temperature will significantly increase your energy costs. (Illustration by Michael Sloan for The Washington Post)
Apollo 11's 40th Anniversary 
The frozen landscape, dry valleys and active volcanoes that make up Antarctica provide a living laboratory for scientific study and a wondrous journey for those traveling to the ends of the Earth. Experience the continent with this special report.
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Watts up, Doc? They certainly are, thanks to the increased power demands of today's supersized flat-screen TVs. California's new efficiency standards for TVs probably means the entire U.S. market will shift accordingly. But the trouble, as they used to say, is not in your set. It's in us.
Penguins aren't just cute: They're also one of the leading indicators of what's happening to the planet.
• PHOTOS: Penguin pressures
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