A woman with Alzheimer's disease walks in a corridor at a retirement house in Angervilliers, France, last month. Sebastien Bozon/AFP/Getty Images hide caption

itoggle caption Sebastien Bozon/AFP/Getty Images

Lowell Austin, an autistic student at Marshall University in Huntington, W.Va., receives tutoring from Stephanie Hurly at the university's Autism Training Center, one of several college programs highlighted on the website College Autism Spectrum. Jeff Gentner/AP hide caption

itoggle caption Jeff Gentner/AP

Brett Hallman had a surgery — as a 25-week fetus — to treat his spina bifida. Now, he's an active first grader who enjoys swimming and other sports. Courtesy of Tara and Jake Hallman hide caption

itoggle caption Courtesy of Tara and Jake Hallman

Author Toni Bernhard, who is house-bound and often bed-bound, says she's learned to cultivate joy through others. Courtesy of Wisdom Publications hide caption

itoggle caption Courtesy of Wisdom Publications

It was Christiane Benson's diagnosis with juvenile Batten disease in 2008 that inspired her parents to start the Beyond Batten Disease Foundation and to develop the universal carrier screening test. Courtesy of Charlotte Benson hide caption

itoggle caption Courtesy of Charlotte Benson

A Dutch man rides his bike by windmills in Kinderdijk, the Netherlands in 2007. Dutch researchers have found that the ability to ride a bike can help doctors distinguish between two similar forms of Parkinson's disease. Evert-jan Daniels/AP hide caption

itoggle caption Evert-jan Daniels/AP