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A new study finds that teens who had access to the Internet on their cellphones were more than twice as likely to engage in sex with a person they met online compared with those without access to the Internet on their phones.

Breast cancer screening for women over 50 saves lives, an independent panel in Britain has concluded, confirming findings in U.S. and other studies. But, the review found that for every life saved, roughly three other women were overdiagnosed.

More than a decade of research hinting that magnesium supplements might boost your brain power is finally being put to the test in a small clinical trial. The research, led by biopharmaceutical company Magceutics of Hayward, California, began testing the ability of its product Magtein to boost magnesium ion (Mg2+) levels in the brain earlier this month. The trial will track whether the ions can decrease anxiety and improve sleep quality, as well as following changes in the memory and cognitive ability of participants. But critics caution that the trial in just 50 people is too small to draw definitive conclusions.

It could be the muffled sound of singing in the shower or that sing-songy indecipherable voice from the Muppets' Swedish Chef. Surprisingly, scientists said the audio they captured was a whale imitating people. In fact, the whale song sounded so eerily human that divers initially thought it was a human voice.

Babies born after in vitro fertilization have an increased risk of birth defects, the latest study shows.

Newly discovered fossilized bones for the world's oldest and most primitive known primate, Purgatorius, reveal a tiny, agile animal that spent much of its time eating fruit and climbing trees, according to a study.

Even a few nights of sleep deprivation, according to a new study, can make your fat cells behave like they're much older and less responsive to the hormone that controls metabolism.

Nearly six in 10 Medicare recipients would pay higher premiums under a hypothetical privatized system, with wide regional differences leading to big hikes in some states and counties, a study released Monday finds.

The largest 100 public pension funds have around $1.2 trillion of unfunded liabilities, about $300 billion above the nearly $900 billion they reported themselves, according to a new actuarial study to be released on Monday.

Shots that protect against cervical cancer do not make girls promiscuous, according to the first study to compare medical records for vaccinated and unvaccinated girls.