In the 1990s, a "healthy choice" meant eating SnackWell's cookies and sugary reduced-calorie yogurt. Why did America love the low-fat food trend?

Alexandria Ocasio-Cortez has catapulted the term "Democratic socialist" back into the spotlight. What does it actually mean to be a socialist?

Birthright citizenship, which holds that individuals are citizens of the nation in which they are born, was codified with the 14th Amendment in 1868.

Living shorelines provide erosion control while providing shoreline habitat and maintaining coastal processes.

Preserved heads decorated with tā moko, or facial tattoos, were sacred objects to New Zealand's Māori. Then Europeans started collecting them.

These 19th-century novelists might seem to have little in common. But for 11 years they wrote each other letters, forging an unusual literary friendship.

A drone flying over a field in Ireland was able to make out the outline of an ancient henge, a circular enclosure that may have had ritualistic purposes.

Today it's easy to have DNA tested. But before that technology was available, Alex Haley's Roots inspired generations to trace their families' histories.

To hide in plain sight while on assignment in foreign nations, agents needed precisely tailored clothes made to look local.

Is the unique Appalachian dialect the preserved language of Elizabethan England? Left over from Scots-Irish immigrants? Or something else altogether?