SAO PAULO/FORTALEZA (Reuters) - Protesters blocked roads in Sao Paulo and marched toward a stadium hosting a major international soccer game in Brazil's northeast on Wednesday in a growing wave of nationwide demonstrations against poor public services, inflation and other woes in Latin America's biggest country.
KABUL/WASHINGTON (Reuters) - Revived Afghan peace talks hit their first roadblock on Wednesday, a day after they were announced, as Afghan President Hamid Karzai said his government would not join U.S. talks with the Taliban and would halt negotiations with Washington on a post-2014 troop pact.
WASHINGTON (Reuters) - The United States uses drones for surveillance in some limited law enforcement situations, FBI Director Robert Mueller said on Wednesday, sparking additional debate about President Barack Obama's use of domestic surveillance.
How long ago did bacteria invade the one-celled ancestors of plants and animals to become energy-producing mitochondria and photosynthesizing chloroplasts? Researchers developed a statistical way to analyze the variation in genes common to mitochondria, chloroplasts and the eukaryotic nucleus to more precisely date these events. They found that the cyanobact […]
Using data gathered by NASA's Lunar Reconnaissance Orbiter mission, scientists believe they have solved a mystery from one of the solar system's coldest regions -- a permanently shadowed crater on the moon. They have explained how energetic particles penetrating lunar soil can create molecular hydrogen from water ice. The finding provides insight i […]