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New government data shows only a quarter of Americans with the AIDS virus have the infection under control. Young people and blacks are least likely to get effective care. That's slightly lower than previous estimates, and means more than 800,000 people aren't benefiting from life-saving drugs that also would lower their level of infection.

The obesity problem in the US may be much worse than previously thought, according to researchers. They said using the Body Mass Index or BMI to determine obesity was underestimating the issue.

The United States Constitution was once a model for charters around the world, but its influence is waning, according to a new study.

Why are fewer Americans getting married these days? A new report shows the current number of married adults has dropped to a record low of 51 percent. For a dose of perspective, back in 1960, 72 percent of U.S. adults ages 18 and older were married.

Some of the earliest Americans turn out to have been artists. A bone fragment at least 13,000 years old, with the carved image of a mammoth or mastodon, has been discovered in Florida, a new study reports. While prehistoric art depicting animals with trunks has been found in Europe, this may be the first in the Western Hemisphere, researchers report Wednesday in the Journal of Archaeological Science.

Americans are living longer, but not in every corner of the country. A new study shows that in hundreds of U.S. counties mostly in the South ...

The federal government says more overweight Americans are squeezing onto buses, and it may have to rewrite bus safety rules because of it.

Consumer confidence rose in February to its highest point in three years as Americans feel more optimistic about their income prospects and the direction the economy is headed.

Four Americans taken hostage by Somali pirates off East Africa were shot and killed by their captors Monday, the U.S. military said, marking the first time U.S. citizens have been killed in a wave of pirate attacks plaguing the Gulf of Aden and the Indian Ocean for years.

Even as they've grown more comfortable with same-sex or unmarried couples raising children, most Americans still view single mothers as detrimental to society, according to a new poll of attitudes toward the country's soaring number of non-traditional families.