Professor John Straayer has taught political science at Colorado State University in Fort Collins for 46 years. He is not surprised that this year's race in Colorado is among the tightest in the nation.
The Proton Semiconductor Sequencer from Ion Torrent Systems Inc. is a new DNA sequencing machine designed to sequence the entire human genome in about eight hours for $1,000.
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Marijuana grower and activist Juan Vaz checks a marijuana plant in the Uruguayan capital, Montevideo, in August. Uruguay's government has sent a bill to Congress that would allow the state to grow and sell marijuana.
Local Syrian doctors prepare to treat a patient in a field hospital in Aldana, Syria, near the Turkish border. Each day, local and expatriate doctors take big risks to treat the wounded in rebel-held areas.
The U.S. Supreme Court is embarking on a new term beginning Monday that could be as consequential as the last one, with the prospect of major rulings on affirmative action, gay marriage and voting rights.
Tunisian artist Nadia Jelassi with two of the sculptures from her exhibit that were attacked by a hard-line Muslim group. Secular Tunisians and Islamists have clashed over multiple issues related to freedom of expression.
Eleanor Beardsley /NPR
NASA says it has found proof that water shaped the rocks on the left, in a photograph taken by the Mars rover Curiosity (left). For comparison, the agency released an image of rocks from Earth (right).