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An uncontacted Amazonian tribe has ended its isolation in Brazil. Fiona Watson, the field and research director for Survival International, explains why this tribal people left its village.

Hailed as a "national hero," Dr. Sheik Umar Khan has treated more than 100 Ebola patients in Sierra Leone. Now the 39-year-old is fighting for his life in an isolation ward.

Republicans say a sting in which false identities were used to sign up for health care has revealed a major problem. Democrats question the premise that people would try to steal insurance.

A new book claims the organic label can't be trusted, especially on food that's imported. Yet there is a global system for verifying the authenticity of organic food, and it mostly seems to work.

The legislation would require any politically active group that spends more than $10,000 to list its donors.

Officials who were attempting to put inmate Joseph Wood to death instead watched him gasp and snort for more than an hour, Wood's attorney says. Gov. Jan Brewer has ordered a review of the process.

The Air Algerie MD-83 en route from the capital of Burkina Faso to Algiers with 116 passengers and crew aboard has been found with no survivors.

In 1701, Antoine de la Mothe Cadillac founded the beginnings of modern-day Detroit — area code 313. Motor City can't throw a big celebration because of its bankruptcy, but there will be some parties.

Unaccompanied, undocumented children from Central America aren't just sparking debate in the Southwest. The question of whether to offer shelter to the minors has led to divided opinions in Iowa.

The Obama administration is proposing new safety rules for railroad oil tank cars, after a series of fiery derailments. The rules would phase out thousands of older cars in two years.