Three years ago, Lee Spievack sliced off the tip of his finger in the propeller of a hobby shop airplane.
What happened next, Andrews reports, propelled him into the future of medicine. Spievack's brother, Alan, a medical research scientist, sent him a special powder and told him to sprinkle it on the wound.
"I powdered it on until it was covered," Spievack recalled.
To his astonishment, every bit of his fingertip grew back.
"Your finger grew back," Andrews asked Spievack, "flesh, blood, vessels and nail?"
"Four weeks," he answered.
That powder is a substance made from pig bladders called extracellular matrix. It is a mix of protein and connective tissue surgeons often use to repair tendons and it holds some of the secrets behind the emerging new science of regenerative medicine.
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