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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.

Steve Cirinna, Lee County Emergency Management coordinator, discusses how his Iowa county is preparing for a flood surge. Cirinna also warns that with fertilizer and propane in the flood water, it can be a long-term health risk.

The Senate has approved and sent to the White House a bitterly contested rewrite of the 1978 Foreign Intelligence Surveillance Act, or FISA. The bill overhauls disputed rules on secret government eavesdropping. It also shields phone companies from lawsuits for their role in the administration's warrantless eavesdropping program.

Russia's President Vladimir Putin has led his party to a landslide victory in parliamentary elections. But opposition groups say voter fraud was widespread. They accuse the authorities of rigging the vote to let Putin retain power after his presidential term ends.

A cheap dollar may be boosting exports, but it's also putting U.S. companies on sale. Foreign firms are snatching up U.S. based companies at the fastest pace in seven years. When the topic is foreign takeovers of U.S. firms it doesn't take much to prompt concerns about loss of jobs and control. But many observers see these transactions as an absolutely normal and inevitable part of globalization.

Scientists have figured out how massive chunks of ice trigger these seismically detectable events when they break off a glacier. The findings could help researchers track ice loss from glaciers.

Alabama voters head to the polls Tuesday in a primary to fill Attorney General Jeff Sessions' vacant Senate seat. Voters will choose Republican and Democrat candidates for the seat that opened when Sessions joined the White House.

Tlacoyos are a doughy corn tortilla of sorts that's cooked on a grill. Whether enjoyed on a plastic plate as street food or fine china in a high-end restaurant, it's been a favorite snack for centuries.

Yahoo has redesign some of its major sites — the latest step in CEO Marissa Mayer's dramatic turnaround of the Internet company. Before Mayer interviewed for the job at Yahoo, her career at Google appeared to have stalled. Renee Montagne discusses this with Nicholas Carlson, who wrote a profile of Mayer for the news website Business Insider.

A protest in the Russian Arctic has dramatized growing problems with oil drilling there. Every country has a stake in the enormously lucrative search for oil and gas in the Arctic, says professor Lawton Brigham. But pollution from reckless attempts at development are evident on an island near the Polar circle.