Dan Huff rests after a long day's work. He spent much of his life incarcerated in the California prison system. Now, he lives in drug- and alcohol-free transitional housing in Portland, Ore. Beth Nakamura for NPR hide caption

itoggle caption Beth Nakamura for NPR

Officers Ned Bandoske (left) and Ernest Stevens are part of San Antonio's mental health squad — a six-person unit that answers the frequent emergency calls where mental illness may play a role. Jenny Gold/Kaiser Health News hide caption

itoggle caption Jenny Gold/Kaiser Health News

STAR-certified physical therapist Jennifer Goyette works with cancer patients at South County Physical Therapy in Westborough, Mass. Courtesy of Jennifer Goyette hide caption

itoggle caption Courtesy of Jennifer Goyette

Claire Lomas walks the last mile of the London Marathon on May 8, 2012 in London, England. After a riding accident left her paralyzed from the waist down in 2007, Lomas completed the race walking 2 miles a day over 16 days with the help of a ReWalk bionic suit (by Argo Medical Technologies). Peter Macdiarmid/Getty Images hide caption

itoggle caption Peter Macdiarmid/Getty Images