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NASA is preparing to launch a new satellite to observe carbon dioxide from space. The satellite could revolutionize our understanding of where this greenhouse gas comes from and where it goes.

Melissa Block talks to NPR's Nina Totenberg and Tom Goldstein of SCOTUSblog about the state of the Supreme Court under Chief Justice John Roberts.

Sens. Chris Murphy and Bob Corker have drawn up a bipartisan proposal to help resolve the Highway Trust Fund's impending financial problems. Their plan would pay for most federal transportation programs with a gasoline tax.

Speaking on the Potomac River waterfront, President Obama advocated for renovating aging American infrastructure with the historic Francis Scott Key Bridge poised behind him. NPR's Mara Liasson reports.

The Supreme Court's decision in the Hobby Lobby case has focused attention on "closely held" businesses. House Minority Leader Nancy Pelosi suggested the decision will have broad ramifications because 90 percent of U.S. businesses are closely held. That figure may be correct, but it's also misleading.

You don't necessarily have to waste your days regretting the mistakes of your youth. People who drop bad habits by their 40s can slow or even reverse damage done to their arteries, a study finds.

Iraqi human rights advocate Hanaa Edwar joins Melissa Block to offer her perspective on the country's security crisis, its effects on daily life and the hopes Iraqis have for the future.

Native Hawaiians on the police force have criticized the ban. Many say tattoos are part of their cultural heritage and should remain in plain sight.

Empty lots have multiplied in parts of Chicago in recent years, so the city is selling them to homeowners dirt cheap. It's an effort to spark renewal in some of the city's most blighted areas.

The presidential vote was held in April. The two-man runoff came on June 14. Preliminary results expected Wednesday have been delayed as one candidate, Abdullah Abdullah, claims widespread fraud.