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Dark matter, which surrounds most galaxies, plays a key role in the structure of the cosmos. But we can't see it. Or can we? Recently, astronomers used a remarkable effect predicted by Einstein to spot a very tenuous bridge of dark matter linking two galaxy clusters.

Wednesday, the U.S. government began a program to temporarily delay deportation for some undocumented youth. In response, Arizona Gov. Jan Brewer signed an executive order denying public benefits to those granted deferred action. Melissa Block talks with undocumented activist Daniel Rodriguez about what deferred-action status will actually change for young people like himself in Arizona.

Families often pull together to help finance a college education, with parents and grandparents chipping in or co-signing loans. But when a federal student loan isn't paid back, the government withholds money from Social Security recipients.

Syria's civil war erupted again on Monday, just one day after the U.N. ended its monitoring mission in the country. Reporter Jon Lee Anderson joins NPR's John Donvan to discuss the different factions that are rising up amid the current confusion.

An accused drug dealer has turned the tables and helped prosecutors convict his defense lawyer of manufacturing evidence to help his case. The hard-nosed strategy is raising questions about whether the Justice Department is chilling the relationship between a defendant and his lawyer.

When salesmen can't compete on price, they try to out-nice each other.

Laura Veirs, Mates of State and more contribute to an album encouraging children to pursue science.

Rep. Jesse Jackson Jr.'s recent diagnosis of bipolar disorder has focused attention on the shame that sometimes accompanies mental health diagnoses in the African-American community. Psychiatrist William Lawson joins NPR's John Donvan to discuss why such a stigma exists.

A flurry of donations to Planned Parenthood during a dispute with Susan G. Komen Foundation is fueling an expansion of breast cancer services. Planned Parenthood is stepping up education about breast health. The funds will help fund mammograms and other tests, as well as the distribution of a tool to help doctors and nurses assess cancer risk.

The U.S. Supreme Court announced Friday that for the first time it will tackle the issue of same-sex marriage. Defying most expectations, the justices said they will examine two cases, presenting the possibility that the court could decide all the basic issues surrounding gay marriage in one fell swoop.