Twenty-five days. That's how long it took Dr. Shinya Yamanaka of Kyoto University to undo more than 30 years of exquisitely programmed biology packed into a woman's cheek cell and just maybe change the world. In a procedure that some scientists thought could take decades to discover, Yamanaka tricked the cheek cell into acting like an embryonic stem cell capable of dividing, developing and maturing into any of the body's more than 200 different cell types. And he wasn't alone: on the same day that he published his milestone in the journal Cell , James Thomson,...
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