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The EPA announces new air-pollution standards for particulate matter. The standard affects what pollution controls power plants and other big industries are required to install. The agency says the change will save billions in health-care costs.

Senate Majority Leader Harry Reid will mount a scorched earth campaign against Tea Party favorite Sharron Angle, who just won Nevada's GOP primary, analysts say. That could save his job.

A look at the missing Mars Global Surveyor and new evidence of water on Mars.

The Israeli-Gaza conflict rages on as the world watches. What can be done to stop the bloodshed in the region? Will peace ever exist in this ancient land? We'll talk with two San Diego professors w

Last week's terror attacks in Mumbai, India have humiliated the Indian government. They've escalated tension between India and Pakistan and they've put new fear in people throughout the world. Dipak G

Rising sea levels are destroying the fields and livelihoods of people on Sagar Island in the Bay of Bengal. Refugees arrived from a nearby island after it was swallowed up by waves. Scientists say climate change is a factor. Residents of the island, which is a sacred place for Hindus, say God is responsible.

The international commission that regulates fishing of tuna and other large migratory fish in the Atlantic voted to sharply reduce the fishing quota for bluefin tuna at their latest meeting. But some scientists say the new quota is too high to sustain the species.

Israel bombs the Beirut airport and a Lebanese army air base, saying it holds Lebanon's government responsible for Wednesday's abduction of two Israeli soldiers -- an act carried out by Hezbollah militants. Nicholas Blanford of the Christian Science Monitor talks with Madeleine Brand about the escalating violence.

Three different space probes have gathered evidence that the top layer of the moon's surface contains hidden stores of water. The moon is generally thought to be a dry place, and the discovery comes as an unexpected — and exciting — surprise for researchers.

Businessman Bob Rubin, Along For the Ride at the RNC