Has this scientist finally found the fountain of youth?

The black mouse on the screen sprawls on its belly, back hunched, blinking but otherwise motionless. Its organs are failing. It appears to be days away from death. It has progeria, a disease of accelerated aging, caused by a genetic mutation. It is only three months old.

I am in the laboratory of Juan Carlos Izpisua Belmonte, a Spaniard who works at the Gene Expression Laboratory at San Diego's Salk Institute for Biological Studies, and who next shows me something hard to believe. It's the same mouse, lively and active, after being treated with an age-reversal mixture. "It completely rejuvenates," Izpisua Belmonte tells me with a mischievous grin. "If you look inside, obviously, all the organs, all the cells are younger."

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