About twice a year, statistics suggest, a pilot somewhere in the world — usually flying alone — deliberately crashes a plane. The Germanwing flight downed last week may be one such case. But most people who fit the psychological profile of the pilots in these very rare events never have problems while flying. Patrik Stollarz/AFP/Getty Images hide caption
Most teenagers with mental health problems don't get any help. iStockphoto hide caption
A University of Missouri study shows that if your Facebook lurking triggers envy, then depression may follow. Adam Hester/Blend Images/Corbis hide caption
Sgt. Mark Miranda, a public affairs specialist at Joint Base Lewis-McChord in Washington state, demonstrates the use of a program in July 2011 that was designed to help calm symptoms of post-traumatic stress and traumatic brain injury. A new class of apps is offering more sophisticated mental health help to struggling teens, including emergency, 24/7 connection to counselors. Ted S. Warren/AP hide caption
Hearing from older students that high school gets better may help teenagers avoid depression. Cargo/ImageZoo/Corbis hide caption
Depressed teens paired with a "depression care manager" were twice as likely to get treatment. Corbis hide caption
One of the scariest parts of advanced macular degeneration can be losing the ability to read facial expressions. Maria Pavlova /iStockphoto hide caption
Finding a good therapist can take time, especially in a new city. iStockphoto hide caption
It's not clear why children, teenagers and young adults would be at greater risk of suicide when they start taking antidepressants. iStockphoto hide caption
Clubgoers prize Special K's hallucinogenic experience, but scientists like it better as a depression treatment. iStockphoto hide caption
Teenagers' sleep patterns may be a clue to their risk of depression. iStockphoto hide caption
Girls are particularly vulnerable to brain changes caused by stress or trauma, researchers say. Allen Johnson/iStockphoto.com hide caption