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Michael Behe

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Michael Behe, a biochemist from Lehigh University closely associated with the Discovery Institute, is one of the leading proponents of intelligent design.

In Darwin's Black Box, he introduced the notion of irreducible complexity, and defined an irreducibly complex system as follows:

By irreducibly complex I mean a single system composed of several well-matched, interacting parts that contribute to the basic function, wherein the removal of any one of the parts causes the system to effectively cease functioning. An irreducibly complex system cannot be produced directly (that is, by continuously improving the initial function, which continues to work by the same mechanism) by slight, successive modifications of a precursor system, because any precursor to an irreducibly complex system that is missing a part is by definition nonfunctional. An irreducibly complex biological system, if there is such a thing, would be a powerful challenge to Darwinian evolution.
Michael Behe, Darwin's Black Box, p. 39.

Behe agrees with most of mainstream science:

For the record, I have no reason to doubt that the universe is the billions of years old that physicists say it is. Further, I find the idea of common descent (that all organisms share a common ancestor) fairly convincing, and have no particular reason to doubt it. I greatly respect the work of my colleagues who study the development and behavior of organisms within an evolutionary framework, and I think that evolutionary biologists have contributed enormously to our understanding of the world. Although Darwin's mechanism--natural selection working on variation--might explain many things, however, I do not believe it explains molecular life.
Michael Behe, Darwin's Black Box, p. 5.
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