The purpose of history is to explain the present - to say why the world around us is the way it is. History tells us what is important in our world, and how it came to be. It tells us what is to be ignored, or discarded. That is true power - profound power. The power to define a whole society.

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Exercise invigorates the body and sharpens the mind.

Plants evolve like every other form of life, and they’ve come up with their own forms of aggression, defense, and so on. In the nineteenth century, most theories concerned animals — nature red in tooth and claw, all that. But now scientists are thinking about nature green in root and stem. We realize that plants, in their ceaseless struggle to survive, have evolved everything from complex symbiosis with other animals, to signaling mechanisms to warn other plants, to outright chemical warfare.

What makes you think human beings are sentient and aware? There’s no evidence for it. Human beings never think for themselves, they find it too uncomfortable. For the most part, members of our species simply repeat what they are told — and become upset if they are exposed to any different view.

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I tried to tell which was Randall, but I could not; in their gowns and masks, they all looked the same, impersonal, interchangeable. That was not true of course. One of those four men had responsibility for everything, for the contact of all sixteen workers present. And responsibility for the seventeenth person in that room, the man whose heart was stopped.

They just posture and pontificate. Nobody tests. Nobody does field research. Nobody dares to solve the problems — because the solution might contradict your philosophy, and for most people clinging to beliefs is more important than succeeding in the world.

Let's be clear: all professions look bad in the movies. And there's a good reason for this. Movies don't portray career paths, they conscript interesting lifestyles to serve a plot. So lawyers are all unscrupulous and doctors are all uncaring. Psychiatrists are all crazy, and politicians are all corrupt. All cops are psychopaths, and all businessmen are crooks. Even moviemakers come off badly: directors are megalomaniacs, actors are spoiled brats. Since all occupations are portrayed negatively, why expect scientists to be treated differently?

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The second reason to abandon environmental religion is more pressing. Religions think they know it all, but the unhappy truth of the environment is that we are dealing with incredibly complex, evolving systems, and we usually are not certain how best to proceed. Those who are certain are demonstrating their personality type, or their belief system, not the state of their knowledge.