'This book is not a contribution to the numerous superstitious beliefs relating to the moon. Rather, the following will demonstrate and above all prove by means of experiments which can be reproduced at any time that the moon does in fact influence certain biological rhythms, evoking them and determining their timing.' So begins Gunter Klein's exploration of the notion of internal clocks. With the fresh perspective of a curious and insightful non-scientist, Mr. Klein examines the question of what force, time or tide, actually provides more influence over cellular biomechanics. Readers may agree or disagree with his hypothesis, but Mr. Klein's provocative outlook is sure to engage the mind and encourage discussion.