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Another member of the research team, a biological anthropologist, hypothesizes that somehow, only a few men accumulated lots of wealth and power, leaving nothing for others.

These men could then pass their wealth on to their sons, perpetuating this pattern of elitist reproductive success.

In Portland, by contrast, most of his friends were in long-term relationships with people they’d met in college, and were contemplating marriage.

Jacob was single for two years and then, at 26, began dating a slightly older woman who soon moved in with him.

Almost immediately, he was surprised by the difficulty he had meeting women.

Having lived in New York and the Boston area, he was accustomed to ready-made social scenes.

In more recent history, as a global average, about four or five women reproduced for every one man.

Physically driven natural selection shaped many human traits.

Although the popular notion is that farming and settlement cushioned people against "survival of the fittest," this study shows that's not true.

These don't make up a large portion of a person's genetics, but they're special because people inherit Y-chromosome DNA exclusively from their male ancestors and mitochondrial DNA exclusively from their female ancestors. This study, published last week in the journal , can't directly account for why the dip occurred.

By analyzing diversity in these parts, scientists are able to deduce the numbers of female and male ancestors a population has. Instead, the team members tried to think through other explanations.

He was passive in their arguments, hoping to avoid confrontation.

Whatever the flaws in their relationship, he told himself, being with her was better than being single in Portland again. Now in his early 30s, Jacob felt he had no idea how to make a relationship work. Would permanence simply happen, or would he have to choose it? All of a sudden I was going out with one or two very pretty, ambitious women a week. They dated for a few months, and then she moved in.

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