In nature, DNA serves as an all-important informational molecule, but, as reporter Nadrian Seeman explains in this month's cover story, "Nanotechnology and the Double Helix", DNA can also be a versatile component for making fantastically small devices. Also in this edition of Scientific American for June 2004: the near-term possibilities of using pillbox sized computers armed with sensors to connect the cyberworld with the real one, the possibility and the barriers of developing human stem cell therapies, the reality of the threat of nuclear attack on the global satellite system, and more.
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