Many beliefs in alternative medicine and esotericism pose an extreme challenge to modern science. If their central claims, particularly those of homeopathy and anthroposophic medicine, are correct, then contemporary physics must be fundamentally wrong or at least grossly incomplete in important aspects. This is even more true for strictly esoteric practices, such as distant healing or dowsing. Martin Lambeck explains the key aspects and phenomena that contribute to the unique tension between modern physics on one side and alternative medicine and esotericism on the other, and describes ways in which the debate could be conducted and resolved rationally. A thrilling and provocative book about a long-standing and intense controversy that involves not only scientific truth but also ethical considerations.