Whether it's a grieving dog, a depressed horse or even a whale mysteriously beaching itself, there is a long history of animals behaving suicidally, behavior that can help explain human suicide, says newly published research.

In a scientific breakthrough that opens a window to now-extinct animals from the prehistoric past, researchers have just successfully recovered DNA from several fossilized eggshells collected from Australia, New Zealand and Madagascar.

The violent temblor — the fifth most powerful quake ever measured — shifted other parts of South America as well, from the southern tip of the continent to northern Brazil.

Four newly identified worm species, including one that sports an unusual green color, have been found wriggling in the sands of the Great Barrier Reef.

Scientists think they've finally found the real location of a city called Neta'im mentioned in the Bible.

After a month in quarantine, American-born panda Tai Shan paced around his new home in southwest China as he was put on public display Tuesday for the first time since his much-anticipated arrival in the country.

Restorers using ultra-violet rays have rediscovered rich original details of Giotto's paintings in the Peruzzi Chapel in Florence's Santa Croce church that have been hidden for centuries.

Experts say there is nothing unusual about the latest spate of earthquakes in Haiti, Chile and now Turkey, but their devastation illustrates how growing construction along the world's fault lines can lead to massive casualties.

Science editor Alan Boyle's Weblog: How did Chile's killer earthquake compare with Haiti's? How much shorter will each day be in the quake's wake? The answers are more complex than the raw numbers suggest.

New research has found that a chameleon's tongue shoots out like a rubber band gun, maintaining high function at even very low temperatures.

Breast cancer survivors who take aspirin regularly may be less likely to die or have their cancer return, new research shows. Those in a large study who took aspirin had a 50 percent lower risk of dying from breast cancer and a 50 percent lower risk of cancer's spread.

People who drink two or more sweetened soft drinks a week have a much higher risk of pancreatic cancer, an unusual but deadly cancer, researchers reported on Monday.

As the first cases in a massive battle over illnesses linked to 9/11 near trial, an Associated Press investigation has found that several of the initial 30 suits contain inconsistent or exaggerated claims about how the workers got sick or how much time they spent at ground zero.

Matt Chandler is trying to suffer well. He would never ask for such a trial, but in some ways he welcomes this cancer. He says he feels grateful that God has counted him worthy to endure it.

Mammograms should begin at 40 for women with an average risk of breast cancer and by 30 for high-risk women, contradicting controversial guidelines from a U.S. advisory panel last year.

More and more researchers are plunging into murky depths, studying tumors in their cellular environments. The new focus on a cancer’s surroundings, researchers say, is a major shift in thinking about why cancer occurs and how to stop it.

What size bra do you wear? How's your sense of smell? Can you still fit into your college jeans? The answers to these questions — plus other weird body clues — may be a surprising predictor of potential future health problems.

As many as 42 percent of women who are at intermediate or high risk of getting breast cancer decide not to get recommended MRI screening, even if it is offered for free, U.S. researchers said on Tuesday.

Radiation from CT scans done in 2007 will cause 29,000 cancers and kill nearly 15,000 Americans, researchers said Monday. The scans have more radiation than previously thought.

As the economy falters and more people go without health insurance, low-income women in at least 20 states are being turned away or put on long waiting lists for free cancer screenings.

The colon cancer death rate in 2020 could be half of what it was in 2000, due to better screening and treatment, says a new report from the American Cancer Society.

A very large, 30-year study of just about everyone in Scandinavia shows no link between cell phone use and brain tumors, researchers reported on Thursday.

Republican lawmakers pressed their case on Wednesday that new U.S. recommendations advising against routine mammograms for women in their 40s could be used to ration healthcare under reform legislation before Congress, a charge Democrats denied.

Understanding how kangaroos repair their DNA could be the key to preventing skin cancer, according to Australian and Austrian researchers.

Most women in their 20s can have a Pap smear every two years instead of annually, say new guidelines that conclude that's enough to catch slow-growing cervical cancer.

Doing the right thing and taking the time to protect yourself against breast cancer has moral weight that policy makers ignore at their peril.  Bioethicist Art Caplan weighs in on the mammogram debate.

A member of the independent panel whose new mammogram recommendations have led to confusion defended the task force's report, saying it was based on the most up-to-date information available.

Health and Human Services Secretary Kathleen Sebelius says federal policy on who should get breast cancer screening has not changed.

The major reversal in breast cancer screening advice is causing a lot of confusion and anger among women who doubt the motivation and timing of the decision.  NBC's chief medical editor Dr. Nancy Snyderman answers your questions.

For many women, getting a mammogram is already a stressful experiences. Now, women in their 40s have the added anxiety of trying to figure out if they should even be getting one at all.

The American Cancer Society, which has long been a staunch defender of most cancer screening, is now saying that the benefits of detecting many cancers have been overstated.

Breaking up your fitness routine is hard to do. But it's crucial for avoiding the bigger heartache of overuse injury, fitness experts say.

Burnout is sneaky — it doesn't happen overnight — but the stages have classic signs. Clueing in to them can help you sidestep a workout slump.

People who complain they have no time to exercise may soon need another excuse.

Experts worry that "The Biggest Loser" focuses too heavily on competitive weight loss — a focus that is at best, counterproductive and, at worst, dangerous.

The country's top coaches and Olympians share their training secrets for building extreme strength, speed, endurance, and agility that can give you a gold-medal edge in your own life.

Overweight people may want to vacation in the mountains rather than at the beach — and not just to avoid putting on a swimsuit.  A new study finds obese people lose weight at high altitudes.

Horrified by headlines about the connection between a sedentary lifestyle and serious health issues, our writer tests a tiny exercise bike she can use while she works.

Going to the gym in January is like going to the mall on Black Friday, to the bar on New Year’s Eve: It’s amateur hour. And, as they say, sometimes what you don’t know can hurt you. Or at least really, really embarrass you.

America’s rapid rise in obesity appears to have leveled off. But there's little reason to cheer. Most of us are already overweight. Has society simply reached a maximum level of tubbiness?

If you’re trying to motivate yourself to get moving in the new year, here’s some inspiration: Mounting research shows that exercise isn’t just good for the body, it’s also good for the brain.

The fight against fat is going high-tech. To get an inside look at eating and exercise habits, scientists are developing wearable wireless sensors to monitor overweight and obese people as they go about their daily lives.

Flipping the switch and making a lifestyle change is the easy part. Look at any health club in January, after all, and you'll see plenty of new faces. The hard part is what comes next.

Forget the deprivation diet and marathon workouts. New research shows that taking baby steps — not giant leaps — is the best way to get lasting results.

In the season 9 premiere of “The Biggest Loser,” contestants got moving with their first challenge — to ride stationary bikes for 26.2 miles. In the end, five players were sent home while the two top “Losers” shed a combined 57 pounds.

When you’re sweating through an intense workout, you probably reach for a sports drink to  rehydrate your body.  But which beverage is right for you?

Studies have concluded that exercise can enhance the immune system, but is the effect great enough to stave off swine flu?

Is it true that exercising will eventually wear out your joints, heart or any other body parts? Should you wait after working out before showering? Smart Fitness answers your queries.

Poll results, congressional head counts and federal deficits aren't the only numbers President Barack Obama has to worry about. Now, he's trying to walk off a marginally high cholesterol count.

A critical new report declares high blood pressure in the U.S. to be a neglected disease — a term that usually describes mysterious tropical illnesses, not a well-known plague of rich countries.

NYT: U.S. government reports concluded that hundreds of people taking Avandia suffered heart attacks and heart failure, but some said the drug should remain available.

You've heard it before: to avoid a heart attack don't smoke, eat right and exercise. But it also may help to be happy, a new study says.

If your doctor says you have elevated LDL cholesterol, here's what you need to know: Only a portion of LDL cholesterol is actually dangerous.

Bill Clinton has a new lease on life, but there's no cure for the heart disease that has twice forced the former president to get blocked arteries fixed.

Yet another health benefit has been linked to eating chocolate: It may decrease your risk of stroke, a new study suggests.

The latest research shows a resting heart's numbers can signal more serious problems.

Did you know that more than 41 million women in America have heart disease? The good news is you can cut your risk with these surprisingly easy lifestyle changes.

Decades of progress in the United States on cutting cholesterol, blood pressure and smoking are being stalled by rising obesity rates, and heart disease will kill around 400,000 Americans this year, experts said on Monday.

Cardiovascular disease and stroke will cost the United States an estimated $503.2 billion in 2010, an increase of nearly 6 percent, the American Heart Association said.

Measuring body mass index or waist size in overweight people can accurately predict the risk of heart disease, Dutch scientists said on Monday.

Bad traffic, Monday mornings and public speaking can be hazardous to your heart.

Federal health officials said Tuesday a popular heartburn medication can interfere with the blood thinner Plavix, a drug taken by millions of Americans to reduce risks of heart attack and stroke.

Women everywhere are making healthy changes. Here is a list of the 10 healthiest cities for women.

Heart attacks aren't just for older, overweight men with high cholesterol and high blood pressure. Even if you work out and eat healthy, you could still be at risk.

A growing body of scientific literature touts the benefits of omega-3 supplementation. Studies show that these special fatty acids accumulate in the brain and can aid children with learning disabilities, reduce violence in prison, and even improve everyday mood.

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