BERLIN (Reuters) - President Barack Obama defended U.S. anti-terrorism tactics on a visit to Berlin on Wednesday, telling wary Germans Washington was not spying on the emails of ordinary citizens and promising to step up efforts to close the Guantanamo Bay prison.
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 […]