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Features

A Puzzle Lies at the Heart of the Atom

Two precision experiments disagree on how long neutrons live before decaying. Does the discrepancy reflect measurement errors or point to some deeper mystery?

By Geoffrey L. Greene and Peter Geltenbort

A Shot against Cancer

Vaccines that target cancer cells using their own DNA could help eliminate tumors and prevent recurrences

By Beatriz M. Carreno and Elaine R. Mardis

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