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Carbon dioxide levels in the atmosphere cycle up and down as plants take it up in the summer and let some of it out in the winter. Over the past 50 years, these "breaths" have gotten larger, as plants in the Arctic are taking up more carbon dioxide during the warmer summers.

President Obama named 16 recipients of the nation's highest civilian honor. Loretta Lynn, Gloria Steinem and Arturo Sandoval are also on the list.

The Japanese government has announced that radioactive groundwater is leaking from the Fukushima nuclear power plant. To try and stop it, the Tokyo Electric Power Company, which owns the plant, has proposed building an underground wall of frozen earth around the reactors. The ice wall is supposed to keep groundwater from flowing in and radioactive water from leaking out, but nobody knows for sure whether it will work.

An ecologist wondered if Hawaiian menus might help explain what happened to Hawaii's sea turtle population. But the menus revealed another marine tragedy: that local fish numbers had dropped to about a tenth of what they once were.

A gap persists in high school physics. A new study finds that girls are more likely to take physics if they see women in their communities working in science, technology, engineering and math.

Astronaut Sally Ride has served as a role model for young women as the first American woman in space. It's for that reason she's one of the 16 people named as recipients of the Presidential Medal of Freedom. Ride will receive the award posthumously — she died last year at the age of 61.

Two years ago, Libya was turned upside down by the Arab Spring movement. David Greene talks to David Kirkpatrick, Middle East correspondent and Cairo bureau chief for The New York Times, about the state of governance and security in Libya.

Jay and Teri Schwandt just had their 12th child — and it's boy just like his 11 brothers. Little Tucker was nine days late, so they thought he might be a girl. Teri's sister has 10 children - they're all boys.

Scientists find the a tantalizing clue about where people may be catching the Middle East respiratory syndrome. Camels on the Arabian Peninsula and Canary Islands show signs that they've been infected with the virus or a close relative.

The chief operating officer is a position increasingly filled by women. Mark Zuckerberg founded Facebook, but Sheryl Sandberg monetized it.