## At home in the universeColleague and confidant of Einstein and Bohr and pioneer of nuclear fission, John A. Wheeler is one of our most original and profound thinkers. In engaging essays formed of reminiscence, science, and conjecture. Wheeler writes of debates and discussions with Bohr, long talks with Einstein in his study at Princeton, and the eloquence and nobility of Hermann Weyl. With simple delight in "the machinery of existence". Wheeler exudes an enthusiasm that illuminates this collection. |

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### Contents

Aids in the Search for Truth | 3 |

Genesis and Observership | 23 |

The Known and the Unknown | 47 |

Copyright | |

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Albert Einstein analysis anthropic principle Astrophys atomic Atomic Physics baryon big bang big crunch billions bits black hole Bohr's central complementarity concept continuum Copenhagen cosmology curvature delayed-choice density distance dynamics E. P. Wigner Einstein electric electromagnetic electron elementary particle energy equation evidence evolution existence experiment field Figure fission forces galaxy genesis geometrodynamics geometry give gravitational collapse Hermann Weyl human idea ideal issue J. A. Wheeler Kramers large numbers lepton light mass mathematical matter meaning measure molecules momentum mystery nature neutron Niels Bohr nuclear nucleons nucleus observer observer-participancy observership past phenomenon Philosophical photon Phys Planck prediction Princeton problem quantum mechanics quantum principle quantum theory question radiation radioactive reactor reality reason relativity sense simple singularity space spacetime star statistical strange structure superspace Teitelboim tion truth understand wave Weyl's word York