Chimp sperm may unlock one of the riddles of human conception. But first you have to collect it.
Four years ago a team of Australian scientists, attempting to create a genetically engineered virus to combat common pests, stumbled across a mechanism that could potentially increase the killing power of a host of human diseases. Their findings, published last year amid great controversy, bring to the fore a question of increasing urgency: Might technologies intended to improve the world provide terrorists and rogue nations with the means to build the ultimate bio-weapon?
The notion that AIDS arose from a polio vaccine made with contaminated chimpanzee cells—the thesis of the best-selling book The River—is far from the only theory about how the epidemic started, and it is hotly disputed. The quest for the source of the epidemic is intensifying, as researchers scour the jungle for clues and try to "walk back" the disease genetically with the help of the world's most powerful computers