An attendant opens a door to a toilet for a visitor in the Tenderloin District in San Francisco, California December 30, 2014. Operated by the San Francisco Department of Public Works, the solar-powered toilets are part of a six-month pilot project aimed to provide clean and secure portable toilets, used needle disposal and dog waste stations throughout the Tenderloin District in an effort to alleviate the problem of human feces on the streets. REUTERS/Stephen Lam (UNITED STATES - Tags: HEALTH SOCIETY)