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From a scapegoat for the "sapping" of the "white race," to a symbol of modern engineering, to a target of the counterculture movement: White bread's been a social lightning rod time and again.

If you had any doubts about how good TV is these days, just take a trip back 50 years to see what America was watching in 1968.

Americans Andrew Z. Fire and Craig C. Mello win the Nobel Prize in Physiology or Medicine for discovering "RNA interference," a way organisms turn off individual genes. The discovery is considered by many scientists to be a breakthrough in modern biology.

The Pew Hispanic Center's latest study reveals new information about how Hispanics in the United States view themselves. Almost all respondents said immigrants should learn English, and young people should learn Spanish.

A poet of the people, the balladeer wrote some of the United States' most important songs, including "This Land Is Your Land." He captured the heart of hard economic times and war while struggling with poverty and personal demons. He would have been 100 this year.

Dakotah storyteller Mary Louise Defender Wilson has won a $50,000 United States Artist Fellowship. NPR's Scott Simon speaks with the 85-year-old North Dakota traditionalist about her work.

For years, it's been saying women should get annual mammograms starting at age 40. Now it says they can start at 45 — and then cut back to every other year starting at age 54.

The ragtag militias that overran Moammar Gadhafi's hometown in Libya included at least one American: 29-year-old Kevin Dawes of San Diego. Dawes says he first went to Libya to serve as a medical aid worker in June, but eventually decided to take up arms after pro-Gadhafi forces started targeting medical staff.

No American has won an Olympic medal in cross country skiing since 1976, but Anchorage skier Kikkan Randall could change that in Vancouver this February. The 26-year-old is now leading a revival for U.S. prospects in the sport.

One Portland, Ore.-area running store owner is exhibiting a runner's calm about news that barefoot running may put less stress on feet, saying Americans are not set up to run barefoot. But companies such as Nike are releasing minimal shoes that that are supposed to simulate barefoot running and other companies are taking advantage of the growing movement.