Human mothers have a relatively long gestation period compared to the rest of the animal kingdom, but a few animal mothers go even further. Here's our list of t

Mother's Day songs. In the history of rock, pop and ballads, there are simply way too many songs about mothers that, frankly, Mom would not be happy about.

Forget the fancy flowers and jewels. These sweet, simple gifts are the way to mom's heart this Mother's Day.

The daughter-in-law and granddaughter of famous explorer Jacques Cousteau continue the mission of water stewardship.

What does your mom really want for Mother's Day? (Hint: You won't find it at the store.)

Don't forget grandma this Mother's Day. The older women in your family have lots to share if you take the time to listen.

U.S. first lady Michelle Obama and Dr. Jill Biden, wife of U.S. Vice President Joe Biden, host a party at the White House on May 10 for mothers, grandmothers an

Tennessee Valley Authority announces plans for economic development projects in Roane County, the site of last December’s coal ash spill.

Ruling is latest twist in a long debate over how to regulate and enforce coal ash disposal.

Despite claims that special interest groups don't have a place in the White House, some reports say that's not the case. Other reports simply don't exist.

A regular marathon will sound like an easy warm-up compared to these crazy yet compelling endurance races.

A new study buries the concept of "fat but fit," and finds that obesity is more dangerous than a lack of fitness.

If you want to try a triathlon, here's what you need to know about the event that combines swimming, cycling and running. Experts Erin Beresini weighs in.

Why aren't women counted in most exercise studies? Their periods tend to mess up the data.

NBA star LeBron James may have just launched a new fitness revolution with his use of "yoga bubbles."

A study in the Lancet looked at over-60 walkers, and those who worked on a busy London street didn't fare as well as the park walkers.

Competitors from around the world line up on an Arctic ice floe to tackle one of the world's most difficult 26.2-mile races.

In the Netherlands, men over 65 on e-bikes are causing a big spike in the cycling death rate. And the Dutch are ahead of the game on all things biking.

Defying stereotypes, teenager Vilde Westeng aims to be the best halling dancer.

Climatologist documents Greenland's warming conditions with a photo of sled dogs splashing in meltwater on top of sea ice.

The Amazon rainforest fires have been burning for 3 weeks, and some are wondering why Brazil's crisis isn't getting more attention.

Air pollution may be responsible for more than 2 million deaths around the world each year.

Tree rings of old eastern red cedars show improved tree growth and physiology since the Clean Air Act's implementation in the 1980s.

Outdoor air pollution has now been classified as 'carcinogenic to humans' by the United Nations.

Tokyo, which cleaned up its act in the 1970s, is a role model as the Chinese capital starts to address some of the world's worst air pollution.

Yes, you read that right.

What good is it if all of the historical cities and natural beauty in China are covered by haze?

Loopholes in the Montreal Protocol may need to be tightened, researchers say.

Air pollution exposure contributes to one in eight deaths around the globe, according to WHO estimates.

Electronics giant announces it will compensate workers relocating to China for the poor quality of air they will have to breathe.

A new report from the American Lung Association finds that nearly 148 million Americans breathe unhealthy air.

A new study by WHO finds that air pollution has worsened since 2011, signaling increased health risks for city dwellers.

This high tech billboard can do the work of 1,200 trees, scrubbing the air of pollutants.

Oregon's Silver Falls State Park is a wonderland of rivers, streams, rainforest and cascading water.

A new initiative in India will employ up to 300,000 youths in an effort to improve air quality and provide opportunities to the unemployed.

Dozens of cities throughout the country have either banned or limited fireworks displays due to the threat of heavy pollution.

Since its release last Saturday, the film on China's crippling pollution has been viewed over 100 million times.

Prime Minister Modi's efforts aimed at tackling local air pollution, but the whole world stands to benefit.

Air pollutants are linked with heart disease, lung disease and other serious afflictions that have long-term impacts.

Paris gives cars the boot on this popular thoroughfare one day a month to promote clean air and exploring the city on foot.

A new study says commuting to work by car may be far more harmful to your health than previously believed.

China's most polluted cities have made strides in reducing air pollution, but there's still work to be done.

This is what London's air would look like without cars.

A 'capped inversion' trapped air pollutants near the ground.

Falling levels of air pollution have resulted in a drop in California's dense tule fog.

A new study suggests that dark matter from the galactic plane may have been what really killed the dinosaurs — and it may one day threaten us.

Re-wilding nature is always controversial, as evidenced by the conflicting views in North Carolina over the reintroduction of the red wolf.

Sudan and two females of his subspecies are under constant surveillance in Kenya, but it may not be enough to save the northern white rhino from extinction.

It's no Jurassic Park, but a flea stuck in amber for 20 million years may still shed light on the Black Death.

Just like 'Jurassic Park,' except with flowers instead of dinosaurs.