The Secret Service admitted to an "inexcusable" series of failures that allowed a disturbed veteran to make it deep into the White House armed with a knife.
Firefox maker Mozilla announced that it is switching to Yahoo as the default service for online searches done through the Web browser in the United States.
Small volcanic eruptions could be slowing global warming by spewing sulfur aerosols that reach the upper atmosphere and reflect sunlight away from the Earth.
Twitter began letting users search through every tweet publicly fired off at the globally-popular one-to-many messaging service since it launched in 2006.