Location 645:

It is a truism of biology that evolution is conservative. When something evolves, it must build upon what nature has already produced. New features may be added, and old features may undergo some alteration, but most things remain the same.

Location 661:

Considering nature as purely static produces serious errors of apprehension. Nature “selects.” The idea of selects contains implicitly nested within it the idea of fitness. It is “fitness” that is “selected.” Fitness, roughly speaking, is the probability that a given organism will leave offspring (will propagate its genes through time). The “fit” in “fitness” is therefore the matching of organismal attribute to environmental demand. If that demand is conceptualized as static—if nature is conceptualized as eternal and unchanging—then evolution is a never-ending series of linear improvements, and fitness is something that can be ever more closely approximated across time.

Location 681:

It is also a mistake to conceptualize nature romantically. Rich, modern city-dwellers, surrounded by hot, baking concrete, imagine the environment as something pristine and paradisal, like a French impressionist landscape. Eco-activists, even more idealistic in their viewpoint, envision nature as harmoniously balanced and perfect, absent the disruptions and depredations of mankind. Unfortunately, “the environment” is also elephantiasis and guinea worms (don’t ask), anopheles mosquitoes and malaria, starvation-level droughts, AIDS and the Black Plague.

Location 685:

We don’t fantasize about the beauty of these aspects of nature, although they are just as real as their Edenic counterparts. It is because of the existence of such things, of course, that we attempt to modify our surroundings, protecting our children, building cities and transportation systems and growing food and generating power. If Mother Nature wasn’t so hell-bent on our destruction, it would be easier for us to exist in simple harmony with her dictates.

Location 698:

The part of our brain that keeps track of our position in the dominance hierarchy is therefore exceptionally ancient and fundamental.17 It is a master control system, modulating our perceptions, values, emotions, thoughts and actions. It powerfully affects every aspect of our Being, conscious and unconscious alike.

Location 705:

Consider serotonin, the chemical that governs posture and escape in the lobster. Low-ranking lobsters produce comparatively low levels of serotonin. This is also true of low-ranking human beings (and those low levels decrease more with each defeat). Low serotonin means decreased confidence. Low serotonin means more response to stress and costlier physical preparedness for emergency—as anything whatsoever may happen, at any time, at the bottom of the dominance hierarchy (and rarely something good). Low serotonin means less happiness, more pain and anxiety, more illness, and a shorter lifespan—among humans, just as among crustaceans.

Location 712:

There is an unspeakably primordial calculator, deep within you, at the very foundation of your brain, far below your thoughts and feelings. It monitors exactly where you are positioned in society—on

Location 734:

When operating at the bottom, the ancient brain counter assumes that even the smallest unexpected impediment might produce an uncontrollable chain of negative events, which will have to be handled alone, as useful friends are rare indeed, on society’s fringes. You will therefore continually sacrifice what you could otherwise physically store for the future, using it up on heightened readiness and the possibility of immediate panicked action in the present.

Location 744:

If you have a high status, on the other hand, the counter’s cold, pre-reptilian mechanics assume that your niche is secure, productive and safe, and that you are well buttressed with social support.

Location 746:

Change might be opportunity, instead of disaster. The serotonin flows plentifully.

Location 749:

You can delay gratification, without forgoing it forever. You can afford to be a reliable and thoughtful citizen.

Location 751:

Sometimes, however, the counter mechanism can go wrong. Erratic habits of sleeping and eating can interfere with its function. Uncertainty can throw it for a loop. The body, with its various parts, needs to function like a well-rehearsed orchestra. Every system must play its role properly, and at exactly the right time, or noise and chaos ensue. It is for this reason that routine is so necessary.

Location 824:

If someone is badly hurt at some point in life—traumatized—the dominance counter can transform in a manner that makes additional hurt more rather than less likely. This often happens in the case of people, now adults, who were viciously bullied during childhood or adolescence. They become anxious and easily upset. They shield themselves with a defensive crouch, and avoid the direct eye contact interpretable as a dominance challenge.

Location 828:

In the simplest of cases, the formerly lowly persons have matured and moved to new and more successful places in their lives. But they don’t fully notice. Their now-counterproductive physiological adaptations to earlier reality remain, and they are more stressed and uncertain than is necessary. In more complex cases, a habitual assumption of subordination renders the person more stressed and uncertain than necessary, and their habitually submissive posturing continues to attract genuine negative attention from one or more of the fewer and generally less successful bullies still extant in the adult world.