Former U.S. Army Sergeant Kristofer Goldsmith talks about his experience in Iraq, which led to his attempted suicide, while testifying on Capitol Hill on May 15, 2008. (Photo by Chip Somodevilla/Getty Images)
Kerri's guest is Dr. Craig Bryan, an associate director of the National Center for Veterans Studies and associate professor of psychology at the University of Utah.
Tens of thousands of people around the world have said they want to go to Mars, even if it means they will never return to Earth. Dozens of them were in the crowd Tuesday night at the Fitzgerald Theater for Science Night Minnesota — Mission to Mars. Read about Science Night.