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  1. Amendments and Corrections |

  2. Special Features |

  3. Special Features |

    • ...M. A. Bettencourt and Geoffrey B. West are both theoretical physicists at...
    Scientific American 23 , 106–107
  4. Research |

  5. Research |

  6. Special Features |

  7. Research |

  8. Research |

  9. Research |

  10. Research |

  11. Research |

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  13. Research |