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Syphilis cases are on the rise. The bacterium that causes the sexually transmitted disease is becoming resistant to some antibiotics. But somehow, penicillin has remained the best weapon against it.

"Ali was a black man who was not concerned with what white America thought of him."

The park attracts millions of visitors each year, but journalist David Quammen warns that balancing tourism and preservation in Yellowstone can be tricky. Originally broadcast April 18, 2016.

Opioid addiction treatment is a growth market, and private equity firms are buying up treatment centers and chains. But it's too soon to say how this might affect access to care and quality.

DNA testing confirms that a 22-year-old law student in Mexico is the boy who was taken from his California home by his father more than two decades ago.

A hometown hero is being laid to rest in Louisville, Ky., Friday, as Muhammad Ali, the boxer and humanitarian, is being buried. Fans from far and wide have come to the city to pay their respects.

A group of specialists called the Gray Team challenged the dogma that said head injuries were serious only if they were obvious and bloody. Bomb blasts can lead to lasting but invisible damage.

The life of boxer Muhammad Ali was celebrated Friday by boxers, religious figures, journalists and former President Bill Clinton at a memorial service in his hometown of Louisville, Ky.

After the jury found Hubbard guilty of more than half of the 23 charges, he's been stripped of his leadership position, and could face up to 20 years in prison for each felony count.

They're wearing the diverse fashions of Africa — but they're not wearing African fashion. A new book explains the difference.