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A Japanese sushi magnate paid $736,000 this week for one 593-pound bluefin tuna, the highest amount ever paid for a single fish. But environmentalists say this extravagant sale may encourage fishermen to continue to exceed set quotas for catching bluefin.

The GOP front-runner started the week telling Iowa supporters, "I need every vote." He didn't know how right he was. After an eight-vote victory in Iowa, he left for the loving embraces of New Hampshire and John McCain. Then came South Carolina, and not quite so much love.

Sunday is the first anniversary of the shootings in Tucson, which killed six people and wounded 13, including Congresswoman Gabrielle Giffords. Memorial events are taking place all weekend; NPR's Ted Robbins tells us how people are commemorating an event they can't forget.

The honey bee population of North America is declining and new research may help answer why. It shows the bees can become hosts of a fly parasite, which causes them to become disoriented and leave their nests. Scott Simon talks with San Francisco State University's Andrew Core, who authored the study.

Scientists aren't sure what's wrong with the orcas in Puget Sound, but they're hot on the trail. A team of researchers is relying on a secret weapon with a killer nose to sniff out the mystery.

With Iran threatening to block U.S. ships from entering the Persian Gulf and the United States vowing not to back down, the stage seems to be set for war. And yet, what's happening with Iran right now may be more of an economic confrontation than a military standoff.

Many still play with the toy, which been around for more than 30 years. The puzzle that challenges players to align a single color on each side first went on the market in 1980. A new generation of players is pushing the limits of the Rubik's Cube using modern technology.

Every four years in January, Washington plays host to the country's biggest "prom." Inaugural balls bring out happy winners, administration bigwigs and a gown — on the first lady — that will become part of history. A Smithsonian exhibition displays some of those gowns.

Whoever wins the Republican presidential nomination will face President Obama in November. The Obama campaign got some meaningful news Friday when unemployment figures improved again.

In Tucson, Ariz., it was a weekend for remembering. On Sunday, it had been one year since the shooting attack that killed six people and wounded 13 more. Rep. Gabrielle Giffords, who was shot in the head, was at a few of the memorial events.