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The death of the vice president's eldest son derailed his own hopes for the White House. But he once had better approval ratings than Hillary Clinton and may have been a more competitive nominee.

The once shy preteen is now a mother of two who has become one of her mother's closest political advisers. On Thursday night, she'll introduce Hillary Clinton as she accepts the Democratic nomination.

Getting an accurate diagnosis is a big hurdle in the current outbreak of Zika virus. There are three kinds of tests for Zika, and each has problems. Scientists are working hard to improve diagnosis.

Federal audits of 37 Medicare Advantage health plans cited 35 for overbilling the government. Many plans, for example, claimed patients with depression or diabetes were sicker than they actually were.

The child, who had contracted polio, was taken in by Mother Teresa when he was 3. What has happened since sounds like a fairy tale.

Tapeworms, hookworms, leeches. Millions of specimens. This collection has it all — except legs.

Senior citizens who don't keep up with technology are at risk of social isolation. A New Mexico nonprofit pairs tech-savvy youth with seniors, and both generations benefit from the human connection.

Twenty-five years after the O.J. Simpson case began, how did it change our views on justice, celebrity and race?

Traditional blood tests still do a better job flagging common inherited diseases. Gene sequencing can be useful for detecting some conditions, but the results can be difficult to interpret.

Forty years ago, the U.S. nuclear industry suffered its worst nuclear accident. Today, the remaining reactor at Three Mile Island is slated to close because of cheaper competition from natural gas.