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Heritage months tend to follow a pattern: They start as a week and grow into a month. But do these celebrations deepen our awareness of our many cultures, or do they constrict it?

An outspoken social critic said the ad relied on "well-known racial stereotypes," implying that all perpetrators of violent of crime are black men. The commercial was directed by the rapper Tyler, the Creator.

As many as half of the world's languages are at risk of disappearing by the end of the century. More aboriginal groups around the world, including Oregon's Siletz tribe, are using "talking dictionaries" and other digital tools to help preserve their native languages.

Carolyn Hopkins is the voice behind public service announcements at airports, subways and theme parks. She tells you a train is coming, to step away from the platform, or to please pay attention to your luggage. And she does it all from her home in northern Maine. Guest host Susan Stamberg talks with Hopkins about her work.

In years following Vietnam, people wanted to dance and Donna Summer provided a soundtrack.

Do you know your tundra from your taiga? The final round of the 2012 National Geographic Bee is being held Thursday, with students between the fourth and eighth grades testing their knowledge of countries, canals and lava lakes. See how you would have done in the preliminary rounds.

Jet injectors have been delivering drugs and vaccines without needles since the Star Trek era, but never caught on widely in real-world medicine. A device developed at MIT promises to change that, with computer-controlled precision and an injection as inconspicuous as a mosquito's jab.

After a relative lull in campaigning, the Republican presidential candidates are back at it Tuesday in Pennsylvania, Delaware, North Carolina and Texas. And a Washington Post-ABC News poll shows President Obama leading prospective GOP nominee Mitt Romney — especially on likability.

During the last 20 years, bachata has risen from the back country of the Dominican Republic to take its place next to salsa in concert halls. Milo Miles considers bachata's humble beginnings and the continuing appeal of its simpler side.

Farm robots are here, not just in Star Wars. Some dairies already use milking machines that clean udders and monitor cow health, plus do the milking, and a fully automated tractor is coming out this fall.