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LOS ANGELES - New research gives some biological clues to why women may be more likely than men to develop Alzheimer's disease and how this most common form of dementia varies by sex.

LOS ANGELES - Scientists are closing in on a long-sought goal — a blood test to screen people for possible signs of Alzheimer's disease and other forms of dementia.

LOS ANGELES - A healthy lifestyle can cut your risk of developing Alzheimer's or other forms of dementia even if you have genes that raise your risk for these mind-destroying diseases, a large study has found.

BETHESDA, Md. - Lying inside a scanner, the patient watched as pictures appeared one by one: A bicycle. A cupcake. Heroin. Outside, researchers tracked her brain's reactions to the surprise sight of the drug she'd fought to kick.

ATLANTA - A scientific panel has downgraded its recommendation that all retirement-age Americans get a top-selling vaccination against bacteria that can cause pneumonia, meningitis and other illnesses.

TORONTO - Accessing medical records through a secure app, texting with health-care providers, using e-consultations for specialists — those are some of the ways Ontario's special adviser on health care envisions the increased use of virtual care in the province.

NEW YORK - Unable to send disease fighters to help battle one of the deadliest Ebola outbreaks in history, U.S. health officials are turning to basketball hall of famer Dikembe Mutombo for help.

WASHINGTON - Doctors should offer a daily HIV prevention pill to healthy people who are at high risk of getting infected with the virus, an influential health care panel recommended Tuesday.

SEATTLE - Marijuana has been shown to help ease pain and a few other health problems, yet two-thirds of U.S. states have decided pot should be legal to treat many other conditions with little scientific backing.

CHICAGO - Dozing off to late-night TV or sleeping with other lights on may mix up your metabolism and lead to weight gain and even obesity, provocative but preliminary U.S. research suggests.

VANCOUVER - Men and women who smoke marijuana could be adding to their infertility woes if they are already struggling to start a family, says an obstetrician-gynecologist who is calling for more research into reproductive aspects of the recreational drug that may be increasingly used in Can…

WASHINGTON - To save babies from brain-damaging birth defects, University of Pittsburgh scientist Carolyn Coyne studies placentas from fetuses that otherwise would be discarded — and she's worried this kind of research is headed for the chopping block.

VANCOUVER - Parents should prioritize healthy habits such as physical fitness, nutrition and sleep over screen time long before kids reach their teenage years when arguments over devices can become a huge issue, says a doctor who leads the Canadian Pediatric Society's digital health task force.

CHICAGO - In a story June 2 about prostate cancer drugs, The Associated Press erroneously described a study involving the drug Erleada. The study tested the drug in men at high risk of having their cancer spread beyond the prostate, not those in whom it already had spread.