When a painting sells for a jaw-dropping price, it makes headlines. Do you know how much these works of art went for?

Different countries have different dining customs. Do you know how to avoid being offensive at the dinner table, no matter where that table is?

Bison have been named our new national mammal. Test your knowledge of this species that's so critical to North America's ecology.

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.

A lot of faulty survival information gets passed around. Can you sort out which actions will save you, and which might kill you?

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?

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?

It's time for some healthy change. Here are some fundamental truths you need to know about diet, exercise and other wellness goals.

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.

Venture capitalists, energy researchers and policy makers gather for first time in New Mexico.

Former Carter advisor and energy guru S. David Freeman will become the 'environmental mayor' of L.A.

Hearth and Home Technologies says 100 million homes can be heated sustainably with wood pellets.

New website pulls together a wealth of information on renewable energy and tracks green stimulus spending.

Google lays out a plan to make renewable energy cheaper than coal.

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.

Finland's cleantech sector traces innovative industry back to ancient roots. A blogger tour of Helsinki and surrounds.

A dramatic film explores the physical and emotional challenges of living in a peak oil scenario.

Answer 20 questions to get your resiliency score -- and find out how self and community-sufficient you are.

A study from the Civil Society Institute reveals that party lines divide many people's feelings about global warming, energy independence and green jobs. Here a

HyperSolar magnifying film can increase solar panel efficiency by up to 300%, making solar competitive with fossil fuels.

Web site and mobile app help you find the lowest gas prices in your area.

In the 10 years since Osama bin Laden became a household name, we have fought a war on terror, watched oil prices skyrocket and continued to get oil from the sa

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

Las Vegas hosts a clean energy summit, and politicians pledge allegiance to green cars, photovoltaic arrays, geothermal and wind turbines.

Harish Hande launched his solar company to dispel the myth that renewable energy was too expensive for poor people. The West could learn something from him.

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

Rich natural gas deposits off the shore of Israel can meet the country's energy needs well into the next century, provided it can be extracted economically.

A well-known Chinese solar power company has filed for bankruptcy, but this may actually be a sign of health for the industry.

Impact Energies sells and leases solar panel systems to people making less than $6 a day in Ghana. It was acquired by Persistent Energy Partners.

El Hierro, the smallest of the Canary Islands, is becoming energy self-sufficient by relying solely on wind turbines and hydroelectricity.

MNN introduces you to the key characters in the Eco-bama drama including Steven Chu, Carol Browner and more.

Energy Secretary Steven Chu fields energy efficiency questions from the public.

The Museum of London will showcase part of a 143-ton chunk of fat, diapers and baby wipes that was removed from the city's sewers.

Sweden is to thank (go figure) for a hot new lifestyle trend known as plogging that encourages participants to beautify cities while burning calories.

Ubiquitous Mardi Gras beads can be made of other things: Biodegradable seed bombs, anyone?