Olival Freire Jr is Professor of Physics and History of Science at the Universidade Federal da Bahia, Brazil. He is the author of The Quantum Dissidents (2015) and David Bohm: A Life Dedicated to Understanding the Quantum World (2019). In 2011 he co-edited Teoria quântica: estudos históricos e implicações culturais with Osvaldo Pessoa Jr. and Joan Lisa Bromberg and was awarded the Jabuti Prize in Science & Technology, the most important literary prize in Brazil.

• Olival Freire Jr, Guido Bacciagaluppi, Olivier Darrigol, Thiago Hartz, Christian Joas, Alexei Kojevnikov, and Osvaldo Pessoa Jr.: Introduction Part I - Quantum physics: scientific and philosophical issues under debate 1: Franck Laloë: Quantum Mechanics is Routinely Used in Laboratories with Great Success, but No Consensus on its Interpretation has Emerged 2: Wayne Myrvold: Philosophical Issues Raised by Quantum Theory and its Interpretations Part II - Historical landmarks of the interpretations and foundations of quantum physics 3: Anthony Duncan and Michel Janssen: Quantization conditions, 1900-1927 4: Massimiliano Badino: Of weighting and counting: statistics and ontology in the old quantum theory 5: Helge Kragh: Dead as a doornail? Zero-point energy and Low-temperature physics in early quantum theory 6: Martin Jähnert and Christoph Lehner: The early debates about the interpretation of quantum mechanics by 7: Christian Joas: Foundations and applications: the creative tension in the early development of quantum mechanics 8: Guido Bacciagaluppi: The statistical interpretation: Born, Heisenberg and von Neumann, 1926-27 9: Klaus Hentschel: A perennially grinning Cheshire cat? Over a century of experiments on light quanta and their perplexing interpretations 10: Daniela Monaldi: The evolving understanding of quantum statistics 11: Osvaldo Pessoa Jr.: The measurement problem 12: Michel Paty: Einstein's criticisms of quantum mechanics 13: David Kaiser: Tackling loopholes in experimental tests of Bell's inequality 14: Thiago Hartz: The measuring process in quantum field theory 15: Alexander Blum and Bernadette Lessel: The interpretation debate and quantum gravity 16: Alexei Grinbaum: Quantum information and the quest for reconstruction of quantum theory 17: Olivier Darrigol: Natural reconstructions of quantum mechanics 18: Klaas Landsman: The axiomatization of quantum theory through functional analysis: Hilbert, von Neumann, and beyon 19: Fabio Freitas: Tony Leggett's challenge to quantum mechanics and its path to decoherence Part III - Places and contexts relevant for the interpretations of quantum theory 20: Don Howard: The Copenhagen interpretation 21: Anja Skaar Jacobsen: Copenhagen and Niels Bohr 22: Elise Crull: Grete Hermann's Interpretation of quantum mechanics 23: Climério Paulo da Silva Neto: Instrumentation and the foundations of quantum mechanics 24: José G. Perillán: Early solvay councils: rhetorical lenses for quantum convergence and divergence 25: Flavio Del Santo: The foundations of quantum mechanics in post-war Italy's cultural context 26: Jean-Philippe Martinez: Foundation of quantum physics in the Soviet Union 27: Kenji Ito: Early japanese reactions to the interpretation of quantum mechanics, 1927-1943 28: Josep Simon: Form and meaning: textbooks, pedagogy, and the canonical genres of quantum mechanics 29: Indianara Silva: Chien-Shiung Wu's contributions to experimental philosophy 30: Sebastián Murgueitio Ramírez: On how Epistemological Letters changed the foundations of quantum mechanics 31: Thomas Ryckman: Quantum interpretations and 20th century philosophy of science Part IV - Historical and philosophical theses 32: Stefano Osnaghi: Bohr and the epistemological lesson of quantum mechanics 33: Olival Freire Jr: Making sense of the century-old scientific controversy over the quanta 34: Kristian Camilleri: Orthodoxy and heterodoxy in the postwar era 35: Paul Forman: The reception of the Forman thesis in modernity and postmodernity 36: Alexei Kojevnikov: Quantum historiography and cultural history: revisiting the Forman thesis 37: Richard Staley: The co-creation of classical and modern physics and the foundations of quantum mechanics 38: Giora Hon and Bernard R. Goldstein: Interpretation in electrodynamics, atomic theory, and quantum mechanics Part V - The proliferation of interpretations 39: Jeffrey Bub: Hidden variables 40: Jeffrey Barrett: Pure wave mechanics, relative states, and many worlds 41: Hervé Zwirn: Is QBism a possible solution to the conceptual problems of quantum mechanics? 42: Karen Barad: Agential realism: a relation ontology interpretation 43: Carlo Rovelli: Relational interpretation 44: Jean-Jacques Szczeciniarz and Joseph Kouneiher: The philosophy of wholeness and the general and new concept of order: Bohm's and Penrose's points of view 45: Valia Allori: Spontaneous localization theories: quantum philosophy between history and physics 46: Decio Krause, Jonas Arenhart, and Otavio Bueno: The non-individuals interpretation of quantum mechanics 47: Dennis Dieks: Modal interpretations of quantum mechanics 48: Gustavo Rocha, Dean Rickles, and Florian Boge: A brief historical perspective on the consistent histories interpretation of quantum mechanics 49: Jean Bricmont: Einstein, Bohm and Bell: a comedy of errors 50: Alexander Pechenkin: The statistical (ensemble) interpretation of quantum mechanics 51: Emilio Santos: Stochastic interpretations of quantum mechanics

It emphasizes the strange nature of quantum theory, which is remarkably productive despite seeming unstable and fractured. Its mysteries are clearly not going to be resolved in the near future, which makes this handbook a launching point for future work rather than a summary of past efforts.