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The anesthetic and club drug ketamine seems to quickly lift depression symptoms. How does it work? Researchers are searching for the answer in an attempt to make a new class of depression medications.

Lamb prices are at an all-time high, but American sheep farmers are worried. They say they need more farmers to raise sheep. And they want existing sheep farmers to increase the size of their flocks to meet growing demand.

Lawmakers and prominent economists on Monday called for changes at the taxpayer-owned mortgage company after NPR, in partnership with ProPublica, revealed that Freddie Mac has placed multibillion-dollar bets against American homeowners.

Analysts expect that a big win by Romney will put him at cruising altitude through February.

The GOP presidential candidate let down his guard and broke into song.

Colbert said the money was used to "materially influence the elections," just as the founding fathers would have wanted. In its FEC filing, Colbert said his super PAC had more than $673,000 in cash on hand.

The numbers underscore the Federal Reserve's view that housing remains depressed.

The prolonged procedure of picking a Republican presidential candidate just gets nastier and nastier. One man maligns another; the victim viciously bites back. And everybody piles on President Obama. A look at why this primary season has taken on a noticeably negative chill.

The deficit is slightly smaller than last year's, amounting to about 7 percent of GDP or two points lower than last year.

In his annual report on national threats, James Clapper said Iran has the technological capacity to go nuclear, but it's unclear whether it has the political will to do it.