Women are often told they don't have to get a Pap test for cervical cancer if they're over 65, but the data behind that recommendation might underestimate their cancer risk, researchers say.

That's because many studies don't take into account that many women have had hysterectomies. The surgery removes a woman's risk of cervical cancer; no cervix, no cancer. And 20 percent of the women over age 20 in this study said they had had that surgery.

In the future, Earth's atmosphere is likely to include a whole lot more carbon dioxide. And many have been puzzling over what that may mean for the future of food crops. Now, scientists are reporting that some of the world's most important crops contain fewer crucial nutrients when they grow in such an environment.

Can corporations shift workers with high medical costs from the company health plan into online insurance exchanges created by the Affordable Care Act? Some employers are considering it, say benefits consultants.

"It's all over the marketplace," said Todd Yates, a managing partner at Hill, Chesson & Woody, a North Carolina benefits consulting firm. "Employers are inquiring about it, and brokers and consultants are advocating for it."

Kentucky leads the nation in the number of children diagnosed with Attention Deficit Hyperactivity Disorder.

Nearly one in five children in the commonwealth has been diagnosed with the disorder, according to numbers released by the Centers for Disease Control and Prevention.

Nearly 19 percent of Kentucky children ages 4-17 have, at some point, been diagnosed with ADHD. That’s well over the national average of 11 percent.

Indiana’s diagnosis rate is nearly 16 percent, with Tennessee’s rate is 15 percent

You can learn more about each state’s rate of ADHD diagnosis here.

The figures come from a 2011 national survey conducted by the CDCP, and show about 6 million children nationwide have received an ADHD diagnosis. It’s not known if the higher levels are the result of over-diagnoses by doctors, higher levels of awareness, or some combination of those and other factors.

Brain training is big business, with computerized brain games touted as a way to help prevent memory loss. But new research shows you might be better off picking up a challenging new hobby.

To test this theory, Dr. Denise Park, a neuroscientist at the University of Texas at Dallas, randomly assigned 200 older people to different activities. Some learned digital photography. Another group took up quilting.

New numbers and demographic information released by the White House Thursday reveal some telling details about the 8 million people who selected new health insurance through and state marketplaces.

Mid State Orthopaedic and Sports Medicine Center is hard to miss. The practice's new 30,000-square-foot building is marked with an enormous sign along one of the main roads in Alexandria, a central Louisiana city of about 48,000 people.

More than two months ago, a nasty mumps virus triggered fever, headache and painfully swollen glands among a handful of students at Ohio State University. Now the outbreak has ballooned to 234 cases at last count, and has spilled into the surrounding community in Columbus, Ohio.

"Columbus officials are calling it the city's biggest outbreak since the development of the mumps vaccine in the 1940s," WOSU reporter Steve Brown tells Shots. "It even pushed them to open a new clinic."

President Obama says that enrollment under the Affordable Care Act has reached 8 million after the March 31 sign-up deadline was extended by two weeks.

"This thing is working," he told reporters at a White House briefing on Thursday.

The president said that 35 percent of those signing up through the federal government's website were under the age of 35. The need for younger, healthier individuals to enroll in the program is considered vital to the success of Obamacare.

A high-resolution map of the human brain in utero is providing hints about the origins of brain disorders including schizophrenia and autism.

The map shows where genes are turned on and off throughout the entire brain at about the midpoint of pregnancy, a time when critical structures are taking shape, researchers reported Wednesday in the journal Nature.