A gunman shot and killed four people including a toddler girl in a Phoenix suburb on Wednesday afternoon before apparently committing suicide, police said.
It was not just U.S. Democratic voters who were looking forward to "hope and change" when Barack Obama became the 44th U.S. president.
The 2012 presidential election is more than six months away, but here is what we know so far: It is going to be close, it is going to be nasty, and the outcome could turn on a series of unpredictable events.
The space shuttle Discovery made its final voyage on Tuesday: a piggyback jet ride to the Smithsonian National Air and Space Museum annex in Virginia.
Cutting government programs is favored as the way to reduce the budget deficit by more than twice as many Americans as those who favor raising taxes, said a Reuters/Ipsos poll.
The Pentagon says it is making progress in developing weapons for its newest battleground - cyberspace - but still faces funding, technology and policy challenges.
Industrial output was flat for a second straight month in March, held back by a drop in manufacturing, according to a Federal Reserve report on Tuesday that suggested a cooling in factory activity.
A welder's torch ignited a small fire on the roof of a building at a nuclear research laboratory in Idaho on Monday, prompting an evacuation, but no one was hurt and no radioactive material was involved, lab officials said.
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