CNN Health

How can you get your kid or teen excited about exercise, and how much physical activity is ideal for growing bodies? Experts weigh in with answers, exercising tips and new research efforts.

Your mouth naturally contains about 700 types of bacteria, some good but others not so much. The mouths of people who routinely drank one or more alcoholic beverages each day contained an overabundance of bad bacteria and a smaller amount of good bacteria than those of nondrinkers, new research has found.

Vertis Boyce is a 70-year-old African-American woman. But her new kidney used to belong to a 24-year-old Hispanic man.

Most pregnant women know to avoid certain foods and drinks, such as raw meat and alcohol. But a new study lends weight to the notion that a high intake of caffeinated substances may also be detrimental to a baby's health.

Could the no-calorie sweetener you rely on to replace sugar in your diet actually cause weight gain instead of the weight loss you were expecting?

William Halford had spent two decades researching and developing a vaccine that he believed could bring relief to the millions of people afflicted with herpes.

In one night, the Savage family lost two sons to opioid overdoses. Now they are working to prevent other families from experiencing the same pain.

Plastic surgery isn't a game, but some apps have turned it into one for kids.

Here's an unfortunate little truism, taken from a study recently published in the Journal of Social and Personal Relationships: "It is not possible to have friends without first making friends."

The CDC warns that an outbreak of E. coli is now connected to all types of romaine lettuce, including whole heads and hearts of romaine, as well as chopped romaine in salads and salad mixes.

Falls, for older people, are serious. They can significantly impair mobility and independence. They may lead to hospitalization and subsequent placement in a long-term care facility or nursing home. And as you get older, recovery is slower.

Finding fossils can be a fact of life for construction crews excavating in California. That's what happened when crews broke ground to begin the new Bay Area Calaveras Dam in 2013. They just didn't expect to find so many.

Hans Asperger has been recognized for decades for his groundbreaking studies on child psychiatry and pediatrics.

Humans have been performing cranial surgery and drilling holes in other people's skulls for a long time. The oldest example of this procedure, called trepanation, dates to 7,300 B.C., according to findings from a site at the village of Vasilyevka in Azerbaijan. That means cranial surgery was happening as long ago as the Mesolithic period.

A police officer in Ludwigshafen, Germany, an industrial city in Rhineland-Palatinate, received an unusual request in March.

Plunge into water at near-freezing temperatures, and your body goes into extreme distress. Your skin screams signals of pain. You can't breathe, because your chest is cramping up. Talking is nearly impossible. Your heart is pounding. Fear mounts -- as it should. Without any protection, you may lose consciousness in under 15 minutes. You'll be dead within an hour.

There's no weed major yet, nor are there textbooks, but a growing number of creative professors have come up with some clever ways to teach about marijuana.

If you smoke or eat pot, you might have encountered the "marijuana munchies," or the desire for salty, sweet or fatty carbohydrate-rich foods when using the drug.

The free-diving Bajau people of Southeast Asia, or "sea nomads," can hold their breath for minutes at a time -- thanks to genetics and their unusually large spleens, a study suggests.