Nurse Priscila-Grace Gonzaga with Gregg Cassin, a San Francisco gay man who has been infected with HIV since the early 1980s. He's a volunteer in a cutting-edge gene therapy experiment to see whether HIV-infected people can be given an immune system that is invulnerable to HIV infection.
Credit Richard Knox / NPR
Timothy Ray Brown, widely known in research circles as the Berlin patient, was cured of his HIV infection by a bone marrow transplant, doctors say. His story inspired scientists to look for new ways to vanquish the disease in other patients.
Cities and cars share a conflicted relationship these days. Environmental concerns, growing traffic congestion and an urban design philosophy that favors foot traffic are driving many cities to try to reduce the number of cars on the road. In cities such as Seattle, Chicago, Toronto and Boston, some people go so far as to claim there is a "war on cars."