Almost every weekday morning, usually before 10:30, an overnight delivery truck with an unusual cargo negotiates the hilly streets on the outskirts of Worcester, Mass., and comes to a halt in front of a brick-and-tinted-glass building called Biotech Three. The courier disappears into the building with one or two large gray containers and drops them off at a small company called Advanced Cell Technology. The gray cases look like toolboxes, but they are actually sophisticated shipping containers, commonly used for transporting materials used in animal-breeding work, and they contain the starting material for a series of experiments that may completely rewrite the tables of human longevity. Or they may be remembered only for being among the most ethically troubling scientific endeavors of our times.

Read more: The Recycled Generation — The New York Times Magazine

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