As vessels become more porous, researchers say, they allow toxins in the bloodstream to reach, and damage, delicate brain cells and raise the risk for dementia.
In northwest Pakistan, a school has reopened after last month's Taliban attack that killed more than 130. Most of the survivors chose to come back, but the healing will take years, they say.
Robert Siegel talks to Maureen Sullivan, senior vice president of strategic services and chief strategy officer for Blue Cross Blue Shield Association, which did the study.
The city's recruitment effort has a very different feel from years past as it tries to attract more diverse candidates. The force is 80 percent white; the population is more than 30 percent black.
In the wake of attacks in Paris, part of the investigation into terror cells in Europe has led to Spain. One of the Paris gunmen, Amedy Coulibaly, is believed to have visited Madrid in the days before he burst into a kosher market, killing four people.
Dominic Ongwen is accused of forcing child soldiers to beat, maim and kill. Only he himself was once a victim — abducted by Uganda's Lord's Resistance Army as a 10-year-old walking home from school.
U.S. diplomats have wrapped up two days of talks with Cuban officials — the highest-level meeting in 35 years. The aim is to start talking through how to restore diplomatic relations following the historic warming of ties announced last month by President Obama and President Raul Castro.