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In a study with about 4,000 Thai schoolchildren, a vaccine for dengue fever works well against some strains of the dengue virus. But the overall level of protection was lower than hoped for. The results suggest that a vaccine for dengue fever can be developed eventually.

Only the summers of 2011 and 1936 have been hotter.

Organizers of the Democratic National Convention in Charlotte, N.C., planned for it to be a massive organizing and registration opportunity for voters in the state, a key battleground. NPR's Brian Naylor reports.

In a tongue-and-cheek move to get more Americans prepared for "real" emergencies, the Centers for Disease Control and Prevention and the U.S. Department of Homeland Security are urging citizens to prepare for the zombie apocalypse. Host Scott Simon has the story.

Some 26,000 teachers and school staff in Chicago were on strike Monday after talks with the city's administration failed to reach agreement on benefits and job security issues.

GOP presidential hopeful Mitt Romney says it is possible to cut tax rates without driving the government deeper into the red, and that he can make up for the lost revenue by closing tax loopholes. But analysts have had a hard time testing Romney's claim because he hasn't offered many specifics.

Throughout the government's transitional period, the Egyptian pound remained stable because the government shored it up through foreign reserves. As those reserves reach dangerously low levels, concern is mounting that a major currency devaluation is imminent.

A legal case under way in Connecticut, involving a group of death row inmates, has attracted some national attention. The trial resumes Tuesday and centers on whether there's been race, gender and geographic bias in Connecticut's death penalty cases. Diane Orson of member station WNPR reports

Late-night negotiations have failed for a second day to resolve an impasse between the Chicago Teachers Union and city officials over such issues as teacher evaluations.

Steve Inskeep and Renee Montagne report on Tuesday's observance in New York City of the 11th anniversary of the Sept. 11 attacks.