Alexander Jones is Leon Levy Director Professor of the History of the Exact Sciences in Antiquity at the Institute for the Study of the Ancient World at New York University and author of A Portable Cosmos: Revealing the Antikythera Mechanism, Scientific Wonder of the Ancient World (2017). Liba Taub is Director of the Whipple Museum of the History of Science and Professor of History and Philosophy of Science at the University of Cambridge. She is the author of Ptolemy's Universe: The Natural Philosophical and Ethical Foundations of Ptolemy's Astronomy (1993), Ancient Meteorology (2003), Aetna and the Moon: Explaining Nature in Ancient Greece and Rome (2008), and Science Writing in Greco-Roman Antiquity (Cambridge, 2017).