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In a 5-4 ruling, the court says the Environmental Protection Agency should have taken into account the costs of complying with regulation.

Only women with more advanced cases of ductal carcinoma in situ benefited from surgery, a study found. Most women do have surgery for DCIS, although it's a controversial diagnosis.

The 2008 presidential race was the first in the post-YouTube era. Candidates tried all kinds of things to break through, including former Sen. Mike Gravel simply throwing a rock in water.

Ductal carcinoma in situ often doesn't turn into breast cancer, but most women have surgery for it. The trend is for less invasive surgery, which hasn't affected survival rates.

A second big study affirms new thinking: Exposing high-risk kids to peanuts beginning in infancy reduces the chance of developing a peanut allergy. This peanut tolerance holds up as kids get older.

A study by the Migration Policy Institute finds that entry by unauthorized immigrants continues to decline, and about half are nabbed by U.S. authorities at least once.

On Friday, the Labor Department said the July unemployment rate held steady at 5.3 percent. If you had to choose, would you take that to mean the economy is too cool or too hot? Weigh the evidence.

These two species have been in danger of extinction for decades, but have responded well to conservation efforts. Those measures are going to stay in effect.

Tell Me More producer Amita Parashar shares her experience visiting Rockaway Beach in New York to help her family clean up after Superstorm Sandy.

ABC News says a man claiming to be Flanagan sent a fax that arrived after the killings, and that the same person also called to identify himself as the shooter.