united states

The U.S. government has been secretly investigating UFOs since 2007.

People's personalities may be shaped by the temperatures of the places in which they grew up, a new study suggests.

It's been a wet, hot American summer, according to a new NOAA climate report.

After years of soaring to new heights, obesity rates in the U.S. appear to be leveling off, according to a new report.

Avoiding gluten is a worldwide phenomenon, but the reasons why people do so vary, a new study finds.

More than 2,000 people in the U.S. return from visits abroad with malaria every year, a new report says.

After World War I showed the horrific effects of chemical weapons, world leaders mobilized to contain these new weapons of mass destruction.

Life expectancy is expected to rise in many countries around the world, but in the United States, that increase is predicted to be smaller than in other countries, a new study finds.

2016 was the second hottest year on record for the U.S. and the 20th consecutive year above average.