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More than 20,000 high-temperature records have been broken so far this year in the United States. It's especially bad in urban areas, where cities are heating up about twice as fast as the rest of the planet. But a researcher in Atlanta is using the heat wave as an opportunity to do something about the warming planet.

Julian Castro will deliver the keynote address Tuesday night at the Democratic National Convention. The San Antonio mayor, 37, draws comparisons to President Obama and has been called the new face of the party. He'll be introduced by this twin, Joaquin, a state legislator.

As the Democratic National Convention kicks off in Charlotte, N.C., the economy is expected to be a central theme. The event is bookended by Monday's Labor Day celebrations and Friday's release of the latest monthly numbers on jobs.

Griselda Blanco was infamous for building the drug trafficking network between Medellin and the U.S. in the '70s and for ordering the deaths of dozens. She served almost 20 years in a U.S. prison. Monday, the 69-year-old "black widow' was assassinated.

A lieutenant to President Hu Jintao has been moved to a lesser position amid reports of his son's involvement in the high-speech crash of a very expensive car.

Medical groups, such as the American Medical Association recommend coverage of services for transgender people. Some companies have moved ahead with benefits, but others have held back. One of their big worries is cost.

The auto industry remains one of the economy's brighter spots. Chrysler's sales were up the most — 14 percent.

The results comes from Zanzibar, an island state of Kenya, where half the people in six rural and urban areas received two doses of oral cholera vaccine. The vaccinations led to fewer bacteria circulating, lowering the infection risks even for those who weren't vaccinated.

Because of droughts, bears are having to search harder and across wider ranges to find food. That's increasingly bringing them into contact with humans. In Aspen, Colo., alone there were nearly 300 "bear calls" to police in August — a record.

But most of them said that despite some disappointments, the president deserves four more years to see his policies through.