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Among them: Two incumbent Pennsylvania congressmen are on the defense amid questions about their ethics and personal relationships; and Maryland candidates for Senate are divided by race and gender.

Sleep researchers say about 30 percent of employees at big firms are so tired they're making as many mistakes as if they were coming to work drunk. Some offices now have "napping pods."

Five states hold primaries on Tuesday and Pennsylvania has the biggest delegate prize. Lourdes Garcia-Navarro talks to former Governor Ed Rendell for some insight into that swing state's politics.

In 1990, Kentucky did something no other state had ever done: It completely changed the way its public schools were governed and funded. Despite big gains, poor districts still struggle to catch up.

A study finds that HIV infection — or the treatment for it — can have an impact on the way the body ages.

Half of states require that women who get mammograms be notified if they have dense breasts because they increase cancer risk. But the letters are often jargony and hard to understand, a study finds.

Dust mite allergies are a common trigger for asthma. A new form of immunotherapy that relies on oral tablets rather than shots reduces the risk of a moderate or severe asthma attack, a study finds.

The killings of gay rights activist Xulhaz Mannan and his friend are the latest in a recent string of grisly attacks in the country.

A new study finds 33 percent of American children between 2 and 19 are overweight, and 17 percent are obese. But researchers say they hope the findings don't overshadow the success stories out there.

It's often said that Washington, D.C., is a town obsessed with politics. Apparently, that obsession extends to its chocolatiers. We visit a factory making politically inspired chocolate bars.