Brain scans using Amyvid dye to highlight beta-amyloid plaques in the brain. Clockwise from top left: a cognitively normal subject; an amyloid-positive patient with Alzheimer's disease; a patient with mild cognitive impairment who progressed to dementia during a study; and a patient with mild cognitive impairment.
It's been a mixed year for Alzheimer's research. Some promising drugs failed to stop or even slow the disease. But researchers also found reasons to think that treatments can work if they just start sooner.
Scientists who study Alzheimer's say they aren't discouraged by the drug failures. "I actually think it was a phenomenal year for research," says Bill Rebeck, a brain scientist at Georgetown University.
Brazilian health officials say an epidemic is taking hold — an outbreak of crack cocaine use nationwide, from the major cities on the coast to places deep in the Amazon.
It's an image at odds with the one Brazil wants to project as the country prepares to host soccer's World Cup in 2014 and the Summer Olympics two years later. But the problem has become too big to ignore.
The Luz district of central Sao Paulo was once grand, with its old train station and opulent buildings. Now, this neighborhood is known as Cracolandia — Crackland.
Originally published on Mon December 31, 2012 3:42 pm
Managing food allergies can be a pain, requiring lots of sleuthing of ingredients in restaurants and supermarkets. But people with potentially lethal allergies to nuts and other foods don't have much choice.
Dozens of smartphone apps offer to make that task easier. Doctors say, though, the apps now on the market just aren't reliable enough.
Originally published on Tue January 1, 2013 12:03 pm
As the nation's first African-American president, Barack Obama benefited from and expanded his party's enormous advantage among minority voters.
But as he prepares to start his second term, Obama hasn't managed to usher in behind him many Democrats who are minorities to top elected office. Conversely, Republicans — despite their highly limited support among non-Anglo voters — have managed to elevate more top politicians from minority backgrounds.