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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.

More Latino students are enrolling in college now than ever before, according to a report by the Pew Hispanic Center. But Latinos still lag behind other groups in preparing for and completing college. Guest host Viviana Hurtado discusses the report's findings with Richard Fry of the Pew Hispanic Center and the College Board's Jim Montoya.

More singles are turning to online dating sites to search for that special someone. They can find dates based on religion, race, ethnicity or even eating habits. Guest host Viviana Hurtado delves into the world of niche dating sites with Erika Ettin. She's an online dating coach and the founder of the Washington-based business, A Little Nudge.

Tango fans are flocking to the Buenos Aires Tango Festival & World Cup in Argentina. The tango is seen as a romantic and seductive dance, but you may not know that the dance may have gotten its start in brothels. Guest host Viviana Hurtado speaks with dance instructor Daniela Borgialli. She's participating in the dance competition.

Two studies suggest that antibiotics early in life may contribute to childhood weight gain. Experiments in mice and a look at the weight of more than 11,500 British babies point in the same direction.

In Colorado and Iowa, two states considered up for grabs in the presidential race, a battle over alternative energy policy is playing a growing role in the debate between PresidentObama and MittRomney

The all-female Russian punk band Pussy Riot is facing two years in prison after being found guilty of hooliganism. According to columnist Anne Applebaum, of all the attention paid to the case, a recent show of support from Madonna could prove most damaging to the regime.

After his comments about rape caused an uproar, Republican Rep. Todd Akin says he's staying in the Missouri Senate race. NPR's Neal Conan and Politico's Charlie Mahtesian discuss the fallout. Politix editor David Mark also joins in for an examination of negative campaign tactics.

Colon joins the Giants' Melky Cabrera as the second player this week to be nailed for doping.

The military says the beard is a challenge to authority. Nidal Hassan says it's his constitutional right.