Christy Turlington Burns launches viral campaign asking mothers to raise awareness about maternal health around the world by boycotting Mother's Day.

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

In honor of all the hard-working mothers in the animal kingdom, here's a collection of adorable baby animals being doted on by their moms.

For Mother's Day, a set of posts that remind us what being a mother is all about.

From today's declining fertility rates to the increasing money people spend on moms, here's a look at motherhood by the numbers.

Photographer Elena Shumilova creates timeless images of childhood that touch people all around the world.

The U.S. tradition began in 1911, but many other cultures offer their own twist on the Mother's Day theme. Mexico's celebration in particular looks like fun.

What happens two months after a major environmental disaster, when the lights go out and everyone stops paying attention?

Massive twitter campaign invites @barackobama to visit Appalachia and see mountaintop removal first hand.

Alabama county’s decision to store coal ash from the Tennessee spill fills coffers, but also spurs worries about consequences.

Cement made from 'fly ash', a byproduct from coal-fired power plants, has a remarkably lower carbon footprint, recycles industrial waste, and is more durable.

Engineer Henry Liu is honored for inventing a way to transform toxic waste into environmentally friendly bricks used for construction.

It's worth remembering that at the end of 2008, more than 1 billion gallons of toxic coal ash slurry was spilled by the Tennessee Valley Authority. When will ou

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.

An expert conditioning coach offers down-and-dirty advice on preparing your body for an obstacle race.

Study finds you may be better off moving your workout indoors.

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

Running and walking may have similar benefits, but are there times when is walking better than running?

A new study reveals that a lean, fit body equals happy teeth and gums.

As the 'Mad Pooper' terrorizes Colorado Springs, many are asking why runners are so obsessed with poop anyhow.

Residents noticed 95-year-old Harvey Djerf struggling on his daily walks, so they came up with a kind solution.

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.

New research out of Australia unlocks clues about how your body responds to exercise at the cellular level.

Study finds bananas do more than help you recover after exercise. They also help reduce pain and swelling.

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.

Balance is tied to both strength and overall physical health, here are some exercises for any fitness level.

Your body clock influences what time of day you burn more calories.

Go ahead and have a seat. New research says it's not the sitting that's the problem.

From your heart to your head, here's why you should lace up your sneakers and walk.

Knowing how to measure metabolic equivalents is an easy way to sneak in exercise and make sure all your movements count.

Thomas Panek just became the first blind runner to complete the NYC Half Marathon with guide dogs.

Your social network predicts your health and wellness more than your fitness tracker, study finds.

Researchers looked at walkers and runners with bent and straight arms to find out.

Eating less is more important than exercise if you want to lose weight.

These half-dozen exercises will help you shed pounds if obesity is in your genes.

Everyone gets winded while climbing stairs, but sometimes it's a little more serious.

The fitter you are, the stronger your brain will be as you age, which can help increase joy and improve cognitive function.

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.

This is what the skies over Beaumont, Texas, look like whenever one of the local refineries loses power.

Before clean air laws were passed in Pittsburgh, smoke left buildings in a nighttime shroud all day, yet air quality issues aren't really in the past.

The Canary is a smoke and carbon monoxide detector-cum-air quality analyzer sporting good looks and remarkable smarts.

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

Visibility in Harbin, China has dropped to 33 feet in the wake of monster smog rolling through the area.

Can a vacuum suck up China's smog? Daan Roosegaarde will test his new technology soon in Beijing's parks.

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.

Four cinder blocks + one minute of time = wonderfully functional rocket stove.

Many American likely aren't aware that the air in their homes and offices may be cause for concern.