tertiary institutions throughout the world in the centuries since. The Church and clergymen have also sought at different times to censor texts and scholars. Thus different schools of opinion exist as to the role and influence of the Church in relation to western letters and learning. One view, first propounded by Enlightenment philosophers, asserts that the Church's doctrines are entirely superstitious and have hindered the progress of civilization. Communist states have made similar arguments in their education in order to inculcate a negative view of Catholicism (and religion in general) in their citizens. The most famous incidents cited by such critics are narratives of the Church in relation to Copernicus, Galileo Galilei and Johannes Kepler. In opposition to this view, some historians of science, including non-Catholics such as J.L. Heilbron, A.C. Crombie, David Lindberg, Edward Grant, Thomas Goldstein, and Ted Davis, have argued that the Church had a significant, positive influence on the development of Western civilization. They hold that, not only did monks save and cultivate the remnants of ancient civilization during the barbarian invasions, but that the Church promoted learning and science through its sponsorship of many universities which, under its leadership, grew rapidly in Europe in the 11th and 12th centuries. St.Thomas Aquinas, the Church's "model theologian," argued that reason is in harmony with faith, and that reason can contribute to a deeper understanding of revelation, and so encouraged intellectual development. The Church's priest-scientists, many of whom were Jesuits, have been among the leading lights in astronomy, genetics, geomagnetism, meteorology, seismology, and solar physics, becoming some of the "fathers" of these sciences. Examples include important churchmen such as the Augustinian abbot Gregor Mendel (pioneer in the study of genetics), Roger Bacon (a Franciscan friar who was one of the early advocates of the scientific method), and Belgian priest Georges Lemaître (the first to propose the Big Bang theory; see Religious interpretations of the Big Bang theory). Other notable priest scientists have included Albertus Magnus, Robert Grosseteste, Nicholas Steno, Francesco Grimaldi, Giambattista Riccioli, Roger Boscovich, and Athanasius Kircher. Even more numerous are Catholic laity involved in science: Henri Becquerel who discovered radioactivity; Galvani, Volta, Ampere, Marconi, pioneers in electricity and telecommunications; Lavoisier, "father of modern chemistry"; Vesalius, founder of modern human anatomy; and Cauchy, one of the mathematicians who laid the rigorous foundations of calculus. Throughout history many Catholic clerics have made significant contributions to science. These cleric-scientists