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IntroductionScience no longer holds any absolute truths. Even the discipline of physics, whose laws once went unchallenged, has had to submit to the indignity of an Uncertainty Principle. In this climate of disbelief, we have begun to doubt even fundamental propositions, and the old distinction between natural and supernatural has become meaningless.I find this tremendously exciting. The picture of science as a jigsaw puzzle, with a finite number of pieces that would one day all be slotted neatly into place, has never been appealing. Experience indicates that things are not like that at all Every new development in the microscope reveals further minute detail in structures once thought to be indivisible. Each enlargement in the power of the telescope adds thousands of galaxies to a list already so long that it is meaningless to all but mathematicians. Even research into what once seemed to be simple behavior patterns has a way of going on forever.Fifty years ago naturalists were content with the observation that bats catch moths. Then came the discovery that bats