Scientists are studying the few extraordinary individuals whose bodies seem able to naturally defend themselves from HIV in the hope of finding new cures. For more than three decades, Loreen Willenberg, a 71-year-old landscape designer living in Sacramento, California, was known to HIV scientists as an intriguing anomaly. Willenberg tested positive for HIV in 1992 . Yet, instead of overwhelming her immune system and ultimately killing her, the virus remained suppressed in her body. She was able