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Apple could scarcely be more dominant in the nascent tablet computing market, but Amazon could change that in a hurry, a new study suggests.

One reason optimists retain a positive outlook on life despite all evidence to the contrary has been discovered, say researchers. A study, published in Nature Neuroscience, suggests the brain is very good at processing good news about the future. However, in some people, anything negative is practically ignored - with them retaining a positive world view.

Contrary to previous studies, giving patients with lung problems omega-3 fatty acids and “antioxidants”appears to do more harm than good, researchers reported Wednesday. A study involving 272 adults who were being treated at 44 hospitals for acute lung problems failed to find any benefits and even indicated the treatment may worsen patients’ condition.

In some cases, Alzheimer's disease may in fact be the result of an infection, and may be even be transmissible, a new study in mice suggests.

Health officials are concerned about the trend at a time when many infectious diseases are making a comeback.

According to a 2000 survey, Americans' worst fear is a cancer diagnosis. One out of every three women and one out of every two men will be diagnosed with cancer in her or his lifetime. It's against this backdrop that the American Association for Cancer Research, which bills itself as the world's largest cancer research organization, posed the question: Where do we stand in the war against cancer?

The whooping cough vaccine given to babies and toddlers loses much of its effectiveness after just three years - a lot faster than doctors believed - and that could help explain a recent series of outbreaks in the U.S. among children who were fully vaccinated, a study suggests....

A new study looks at child abuse cases before, during and after the economy's 2007 crash, and found that abusive head injuries increased dramatically after the financial meltdown.

Parents, if you want your kids to get more exercise, you'd be wise to get out of their way. In a new study, published in the American Journal of Preventive Medicine, researchers sought to observe how kids play in parks.

"Munchies" aside, pot smokers are actually less likely than no-smokers to put on excess weight, according to a study by a French researcher.