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Two top intelligence officials have testified in Congress about the implications of climate change for U.S. national security. They discussed an assessment that identifies parts of the world where climate change could produce political instability.

On the African savannah, elephants fight an endless war with ants that live on small thorn trees that the pachyderms like to eat. When researchers separated the ants and the elephants, the trees were the biggest losers.

NPR's Alex Chadwick talks with Christian Science Monitor reporter Scott Baldauf, reporting from the Imam Ali Shrine in Najaf, Iraq. Insurgent leader and Islamic cleric Muqtada al-Sadr has rejected an earlier deal calling for him and his followers to disarm and leave the holy site. The interim Iraqi government could respond with military force.

Mississippi gets its chance to choose between Hillary Clinton and Barack Obama on Tuesday. Polls show Obama with a clear lead, but with delegates now the name of the game, the Clinton campaign is fighting for every one it can get.

A new study finds that moths can remember things they learned when they were caterpillars — even though the process of metamorphosis essentially turns their brains and bodies to soup. The finding suggests moths and butterflies may be more intelligent than scientists believed.

Amid pollution, protests and impressive pomp and circumstance, the opening ceremony kicked off the Beijing Olympics Friday. More than 90,000 visitors were in attendance.

The causes and treatment for autism continue to attract the attention of researchers, the medical establishment, and concerned parents. This week, a conference at the University of San Diego explores

President Bush's budget for the upcoming fiscal year marks a change in the way the federal government supports scientific and medical research. For the first time in decades, funding for the National

NASA's administrator says the agency will reveal the results of an aviation survey that found near collisions, runway interference and other safety problems occur far more often than previously believed.

Environmental groups say a new plan is needed to manage the Sacramento Delta. The estuary provides drinking water to two-thirds of the state's population. KPBS Reporter Ed Joyce has details.