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A new blood test for people in their 70s can detect who will develop Alzheimer's disease. A positive result could help people prepare. But since there's no treatment, will people really want to know?

There's been lots of debate about whether tiny amounts of the chemical have the potential to cause health problems. A new FDA study supports a previous conclusion that the chemical is safe for people.

Izidor Ruckel lived in a Romanian orphanage where children were neglected. Scientists say that lack of attention can damage a child's brain. But Ruckel thinks his adoptive parents' love saved him.

Researchers say changes rolled out last May are likely to have a bigger effect on government statistics than on the care of the nation's children. Still, advocates worry that narrower definitions could lead to a loss of coverage for some children.

These cousins of the shark send thousands of waders and surfers yelping for medical help each year. A powerful toxin in the barb of the ray's tail triggers a "knifelike pain" that can last for hours. Best prevention? Do the "stingray shuffle."

Scientists hope to solve mysteries of the human brain by studying much simpler neural networks � like the brain circuits of fruit flies and mice. Already such research is turning up clues to why many people with autism are easily overwhelmed by bright lights and loud sound.

An experimental technique called optogenetics is starting to change the way researchers look at the brain. The tool allows them to switch entire brain circuits on and off using light, and may help figure out what's going wrong in brain ailments from epilepsy to depression.

The use of marijuana for PTSD has gained national attention in the past few years as thousands of traumatized veterans who fought in Iraq and Afghanistan have asked the federal government to give them access to the drug. Marijuana's active ingredient has been shown to calm the brain's fear circuits. Of course, there are drawbacks and side effects to contend with.

Forecasters expected the 2013 Atlantic hurricane season to be really busy � the National Oceanic and Atmospheric Administration told Americans to expect between seven and 11 hurricanes. But this year has been one of the quietest on record. Why were the predictions so far off?

Scientists have identified special cells in the brain's hippocampus that mimic a trick of some digital cameras. These cells automatically 'tag' the memory of each event in our lives with information about where that event took place � the better to recall, perhaps, where we left our lost keys.