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.

Republican candidates are battling in New Hampshire this weekend, ahead of Tuesday's make-or-break primary. With six main candidates still in the race, a main point of contention among them is: Who's the REAL conservative?

The small New England state, which holds its primary on Tuesday, may not be racially diverse. (In fact, it's 93.9 percent white.) But its residents defy stereotypes with their political independence. More voters in the state are registered "undeclared" than Republican or Democrat.

In the year that's followed the shooting that left six dead and 13 wounded — including Rep. Gabrielle Giffords (D-Ariz.) — the nation has mourned with Tucson as the city has healed.

They want to rescind a law providing financial aid for students who are living in the state illegally. Supporters of the initiative fell short of the signatures needed to get it on the ballot.

In 1952, the federal government created a program that encouraged Native Americans to move off reservations and into cities such as Chicago, Denver and Los Angeles. They were lured by the hope of a better life, but for many that promise was not realized.