Health

The typical first-time mother takes 6 1/2 hours to give birth these days. Her counterpart 50 years ago labored for barely four hours.

That's the striking conclusion of a new federal study that compared nearly 140,000 births from two time periods.

One big implication: Today's obstetricians may be rushing to do cesarean sections too soon because they're using an out-of-date yardstick for how long a "normal" labor should take.

A government advisory committee has reconsidered its advice to keep certain details of bird flu experiments secret.

Revised versions of manuscripts that describe two recent studies can be openly published, the committee now says. The decision could help end a contentious debate that has raged within the scientific community for months.

In response, the editors of two journals immediately said they planned to publish the research soon.

Any dog owner will tell you that they're a lot less stressed out when they're with their dog. Even at work. And now science agrees.

People who took their dogs to work in an office in Greensboro, N.C., had lower stress levels through the work day, as reported on self-reported test.

The employees who hadn't brought their dogs to work said their stress levels increased through the work day. So did the non-pet owners. But the dog owners said they stayed mellow as the day went on.

UPDATE 4:23 p.m.

The U.S. Food and Drug Administration has denied a call to ban the plastic additive BPA from food packaging. The action comes after government scientists found little reason to think people are being harmed by the chemical.

The FDA was responding to a petition from the Natural Resources Defense Council, which called for the ban on BPA, also known as bisphenol A, from any use where it comes in contact with food.

There will be no more "Mr. Nice Guy" in New York. No more "K2," "Skunk" or "Zohai" either.

The New York State Health Department banned the sale of synthetic marijuana products like those on Thursday. So all kinds of wacky stuff that's made to get people high — but is often disguised as potpourri, incense or some mixture of herbs — is now verboten.