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A huge amount of ancient helium rises from the rocks beneath Yellowstone National Park each week — about enough to fill a Goodyear blimp. Scientists say it's due to a huge volcano underneath the park.

Critic Alex Gilvarry calls Jason Porter's first book "a humorous insight into the human condition."

Chick-fil-A's plan to ditch antibiotics in its birds is part of a small but growing trend. Driving the growth is concern about the risks associated with routine use of antibiotics in farm animals.

Talks in Vienna about Iran's nuclear program kick off what could be a year of negotiations. Negotiators are seeking a deal to follow the temporary agreement now limiting Iran's nuclear program.

President Obama is meeting with heads of state from Canada and Mexico. These North American neighbors are often called the "three amigos." They are expected to talk about trade and border security.

It's a busy day in Sochi: At the rink, the Russian men's hockey team was knocked out and the U.S. men's team faces the Czech Republic, while at the track, the U.S. women hope to medal in bobsledding.

The U.S. and European powers are hoping that the government and protesters can restart a political dialogue. But they have few levers of influence. Russia has plenty of leverage, but different aims.

With his gold medal win Wednesday in the Giant Slalom, American skier Ted Ligety cements his place as the world's greatest in the sport. Tamara Keith reports from Sochi with details on Ligety's run.

Rensselaer Polytechnic Institute is trying to help Alzheimer's patients experience fewer behavioral issues. Robert Siegel speaks with researcher Mariana Figueiro and psychiatrist Guerman Ermolenko.

Mohamed Abdi Farah's life and career changed when he was caught in a national calamity in 2011. Now, he hopes to become his country's representative in Eurovision, the Europe-wide singing competition.