Meeting the Universe Halfway is an ambitious book with far-reaching implications for numerous fields in the natural sciences social sciences & humanities In this volume Karen Barad theoretical physicist & feminist theorist elaborates her theory of agential realism Offering an account of the world as a whole rather than as composed of separate natural & social realms agential realism is at once a new epistemology ontology & ethics The starting point for Barad's analysis is the philosophical framework of quantum physicist Niels Bohr Barad extends & partially revises Bohr's philosophical views in light of current scholarship in physics science studies & the philosophy of science as well as feminist poststructuralist & other critical social theories In the process she significantly reworks understandings of space time matter causality agency subjectivity & objectivity In an agential realist account the world is made from entanglements of social & natural agencies where the distinction between the two emerges out of specific intra-actions Intra-activity is an inexhaustible dynamism that configures & reconfigures relations of space-time-matter In explaining intra-activity Barad reveals questions about how nature & culture interact & change over time to be fundamentally misguided & she reframes understanding of the nature of scientific & political practices & their interrelationship Thus she pays particular attention to the responsible practice of science & she emphasizes changes in the understanding of political practices critically reworking Judith Butler's influential theory of performativity Finally Barad uses agential realism to produce a new interpretation of quantum physics demonstrating that agential realism is more than a means of reflecting on science; it can be used to actually do science