These unusual creatures are stunningly beautiful and surprisingly important to life on Earth. Show us what you know!

Step aside, retrievers and beagles, and let these rare dogs trot into the spotlight. From Pulis to Leonbergers, how much do you know about these breeds?

The online dictionary Dictionary.com added a number of popular words culled from headlines and social media. Can you define them?

Sheep provide us with meat, clothing and even scientific illumination, but how much do you know about them? Find out with this quiz.

We use calendars to keep track of our days, our weeks and our years. But how much do we really know about them?

We're surrounded by any number of dangers, but which ones should you really worry about? Take the quiz to find out what's more likely to summon the Grim Reaper.

Nobel by the numbers: How much do you know about the history of the Nobel Prize? Take the quiz.

Test your knowledge of all things autumnal.

Bacteria live everywhere in your body, including your gut. These microbes have quite an impact on your health. Do you know what they do?

Whether it's a white lie or a whopper, fibs are part of our daily lives. We like to think we're honest but, well, we're not. Test your falsehood expertise.

The Earth's mountains, rivers, animals and rocks have been around for millions or billions of years. Do you know which ones have been around the longest?

Dogs have incredible senses and are like superheroes on four legs. Take this quiz to test your canine know-how.

National Park and Earth Week are right around the corner — see how much you know about our nation's protected areas.

Whether you're crying tears of joy or crying over spilled milk, how much do you really know about the tears rolling down your face?

Lightning is more than just a stunning spectacle. Take our quiz to see how much you really know about this electrifying natural wonder.

Think you know everything about that special day of scary movies and sugar highs? Test your Halloween smarts ... if you dare.

You use pasta in sauce, in soups and in salads. But do you know the names of the different pasta types?

When the going gets tough, some animals get going — to bed. Take our hibernation quiz to see how much you know.

Every two years, the National Science Foundation asks 10 questions to see how much Americans know about science.

Pickens: 'If you don't think that you're gonna see a $200 barrel of oil, you're joking.'

Matt C. Rogers, senior DOE advisor talks about awarding stimulus money for top energy projects.

Climate activists call for action to strengthen the most important piece of environmental legislation in history.

When it comes to decisions on electricity and energy policy, women do not have the facts they need.

The vision of an energy-efficient super grid that allows powers companies to communicate real-time may be possible through Google-Spectrum Bridge partnership.

Oilman's plan still aims for energy independence, but now focuses on conversion of tractor-trailers to natural gas instead of giant Texas wind farm.

Renewable energy is a powerful force for the decentralization of Big Energy (and Big Government). It's odd that it isn't more popular in supposedly 'radical' an

Actor joins fight against the Keystone XL pipeline, a route connecting the tar sands in Canada to refineries on the Gulf of Mexico.

Music for Relief, a charitable network of music greats, wants to help light up the darkest homes in Africa though the Power the World campaign. The goal: Lift m

Japan's plan to wean off nuclear power could help lead a global push toward cleaner, more efficient civilization, says U.S. energy guru Amory Lovins.

If fracking techniques pollute water supplies, what will happen to beer production?

The Guest-Imator is a digital portion calculator that even considers the amount of leftovers you want to have. It works for vegan meals, too.

Whether it's fresh or canned, pumpkin freezes really well.

Mayor Sadiq Kahn wants Londoners to stay hydrated with public water fountains while generating less plastic waste.

Organic supermarket chain EkoPlaza teams with an anti-plastic waste group to launch a supermarket aisle liberated from plastic packaging.

The specialized DNA of cockroaches makes them dumpster divers extraordinaire.

A study found that while plastic bag litter has decreased in the U.K. seabed, other forms of pollution have increased.

In England, Tesco supermarket is overhauling its fresh produce department to fight food waste.

This weekend will feature several overlapping events meant to combat a growing plague of garbage around the world.

Although new on the Indian retail scene, Ikea already has big plans to alleviate one of the country's largest environmental ills.

You may love Amazon Prime, but the environment doesn't.

Copenhagen gains an unusual new landmark in the form of a multitasking waste-to-energy plant designed by Bjarke Ingels Group that functions as a ski slope.

Malaysia and the Philippines are forcefully rejecting trash from wealthier countries.

When you can smell garbage from miles away, pizza doesn't stand a chance with bears.

Wildlife biologist Steve Barlow has invented a nest box that can be added to utility right-of-way markers across the U.S. and Canada.

In case you want to give brain-training games a shot, here are 4 to try.

Are ex-KGB hackers behind "Climategate"? What's the latest drama in Copenhagen? Can a regular, affordable home really produce more power than it uses?

Finally.. an iPhone app that decodes the labyrinth of climate hoaxes and skeptic psuedo-science.

255 top climate scientists are reiterating their conclusions on global warming in the face of increased e-mail attacks.

A study funded by the Koch brothers debunks Climategate, but the cable news media doesn't cover it.

'Hackergate' — a desperate attempt by climate skeptics to revive the manufactured 'Climategate' scandal in advance of U.N. climate conference — will backfir