A theoretical physicist and feminist theorist, Karen Barad elaborates her theory of agential realism, a schema that is at once a new epistemology, ontology, and ethics. Preface and Acknowledgments ix PART I ENTANGLED BEGINNINGS Introduction The Science and Ethics of Mattering 3 One Meeting the Universe Halfway 39 Two Diffractions: Differences, Contingencies, and Entanglements That Matter 71 PART II INTRA-ACTIONS MATTER Three Niels Bohr's Philosophy-Physics: Quantum Physics and the Nature of Knowledge and Reality 97 Four Agential Realism: How Material-Discursive Practices Matter 132 PART III ENTANGLEMENTS AND RE(CON)FIGURATIONS Five Getting Real: Technoscientific Practices and the Materialization of Reality 189 Six Spacetime Re(con)figurings: Naturalcultural Forces and Changing Topologies of Power 223 Seven Quantum Entanglements: Experimental Metaphysics and the Nature of Nature 247 Eight The Ontology of Knowing, the Intra-activity of Becoming, and the Ethics of Mattering 353 Appendix A Cascade Experiment, by Alice Fulton 397 Appendix B The Uncertainty Principle Is Not the Basis of Bohr's Complementarity 399 Appendix C Controversy concerning the Relationship between Bohr's Principle of Complementarity and Heisenberg's Uncertainty Principle 402 Notes 405 References 477 Index 493