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Only recently have researchers begun to understand how the teen brain is wired and that some of what appear to be teens' senseless choices may result from biological tendencies that also prime their brains to learn and be flexible.

Free birth control led to dramatically lower rates of abortions and teen births, a large study concluded Thursday, offering strong evidence for how a bitterly contested Obama administration policy could benefit women’s health.

Under Romney’s proposed health care plan, American families buying non-group health insurance would pay nearly double what they pay under Obamacare, according to a new study by Families USA entitled "ObamaCare versus RomneyCare versus RomneyCandidateCare." That includes both comparative insurance premium payments as well as out-of-pocket expenses.

Far more civilians have been killed by U.S. drone strikes in Pakistan's tribal areas than U.S. counter-terrorism officials have acknowledged, a new study by human rights researchers at Stanford University and New York University contends.

A civil rights group says photo ID laws and proof of citizenship rules could deter Latinos from voting.

Poor smokers in New York spend 25% of their income on cigarettes, a new study finds. The state has the nation's highest cigarette tax and a pack there can cost up to $12 (though many smokers buy cheaper packs online). Wealthier smokers feel the sting less: those earning $60,000 a year or more spend just 2% of their money on cigarettes. Smokers' rights groups say the taxes punish poor smokers but health officials say they help many people quit.

Men in a Danish study who worked out for 30 minutes a day lost more weight than those who worked out vigorously for a full hour each day.

There's no link between chronic fatigue syndrome and a mouse virus known as XMRV, says a study out today that researchers say eliminates a possibility raised by a study in 2009. Researchers tested the blood of 293 people with and without the debilitating condition and found no trace of the virus.

Kids with higher levels of the widely used substance BPA in their bodies are more likely to be obese, according to the first large-scale, nationally representative study to link an environmental chemical with obesity in children and teens.

Finally, there’s good news on the child obesity front. A new study published online today suggests that inexpensive, community-based obesity intervention programs can work very well for kids who struggle with weight issues.