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Five states hold primaries Tuesday, with Senate races in Pennsylvania and North Carolina getting top billing.

By some estimates, there are millions of people working in an informal economy in Mexico. Many are street vendors who ply their trades in the neighborhoods of the capital. They have no access to loans or financial support.

A data center in DeKalb, Illinois, is the testing ground for a new sustainable concrete. Is this greenwashing or can new mixtures contribute to reducing the construction industry's carbon footprint?

High gas prices have set off calls for conservation and investigation of price gouging. But among residents of Arizona, high gas prices have also provoked some less predictable reactions.

A nine-month-long federal racketeering trial involving the tobacco industry ended Thursday. Judge Gladys Kessler now will decide whether big tobacco comanies conspired to hide the dangers of smoking. In closing arguments, Justice Department lawyers asked the judge to impose marketing restrictions on cigarettes.

European Union leaders are gathering in Brussels for a two-day summit that will address problems with the organization's budget. The meeting is occurring two weeks after France and the Netherlands rejected a proposed E.U. constitution

White House Deputy Chief of Staff Karl Rove's role in leaking the name of CIA operative, Valerie Plame remains undefined. Reports describe Rove as tacitly confirming her identity to a reporter before the story was published. A federal grand jury investigation is continuing.

Britain leads Europe in two minutes of silence for the 53 people killed in last Thursday's attacks on London's transportation system. Traffic and business came to a halt -- along with subways and rail lines. Last week's attacks are seen as suicide bombings -- the first in Western Europe.

As the Tour de France rolls into the mountains, American rider Lance Armstrong has surrendered the lead. NPR's Alex Chadwick gets an update from John Wilcockson, who has covered the Tour de France for almost 40 years.

Police and soldiers storm homes, schools and synagogues in several Gaza settlements, in a bid to evict diehard opponents of the Israeli withdrawal. Israeli media reports say more than 40 people -- mostly police and soldiers -- were injured.