A key question: Will the conflict divert voters' attention from the economy this fall?
New study is part of a broader effort to understand the early years of the universe, after the big bang.
A group of scientists has suggested that species threatened with extinction by climate change should be moved to other parts of the world where they could survive.
Recent economic woes are raising new doubts about the benefits of globalization.
The two presidential candidates plan trips abroad to build their foreign-policy credentials.
Virtual college campuses host international student exchanges.