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Oklahoma is home to bison who roam freely on the last stretches of open prairie. Once a year, the bison are rounded up, vaccinated and de-wormed. It's part of the effort to bring back the herds.

President Obama says the U.S. must lead the charge to reduce burning of fossil fuels. But American lawmakers are divided on limiting carbon emissions and opponents say they'll challenge any new rules.

Robert Dear lived off the grid, and those who knew him described a troubled man who preferred solitude. Police say Dear opened fire at a Planned Parenthood center, killing three and wounding nine.

The storm dumped freezing rain from Texas all the way to Iowa. Authorities in Kansas reported several deaths due to car accidents and flooding claimed three lives in Texas.

The Pope preached reconciliation Sunday in Central African Republic, a country that has seen clashes between Christian and Muslim militias.

Protesters gathered on the eve of a global conference on climate change. About 200 activists defied a ban on mass demonstrations and they were met by riot police.

The program allowed the U.S. government to collect data on Americans' phone calls in bulk. Under the new system, the government needs a court order to query a database kept by phone companies.

The 68th United Nations General Assembly has declared 2015 the International Year of Soils. In honor of this, nature.com published a reminder last week…

A polling group has published a list of the least and most popular senators, according to their home-state approval ratings. Bernie Sanders, the Vermont…

In the aftermath of the shooting at a Planned Parenthood clinic in Colorado Springs, residents are moving on with their daily lives while remembering the victims of the attack.