But only about 60-70% of any population is securely attached, so that means that 30-40% are insecurely attached.
"Seventy percent of any population spends $150 or less on health care in a year," Mr. Weinberg said.
Fertility was also very high, as it had to be to sustain the existence of any population under such conditions of mortality.
Based on a preliminary analysis of the tribe's stool, he said, "it looks like the Hadza have one of the most diverse gut ecosystems in the world of any population that's been studied".
(The so-called "Maharishi effect" decrees that if the square root of 1% of any population practises transcendental meditation, it will produce measurable improvements in the quality of life, "thus creating sustainable world peace").
For instance, the Yanomami tribe of Brazil, who eat a diet low in salt and saturated fat and high in fruit, have the lowest mean blood pressure of any population on earth – 95/61.
They also suggest retaining, in its original form, some part of any population that has been edited — a kind of molecular Noah's Ark .Esvelt and his colleagues have developed a system to keep gene drives from spreading where they are not wanted.
In the case of the Durant piece, the outcry was fuelled not only by anger about the cultural appropriation of murder but also by another unfortunate resonance: the current suicide rate among Native American teen-agers is the highest of any population in the United States.
Surveys of any population require careful design, bearing in mind the potential for sample biases.
The size of any population is given and remains the same in each generation.
"Clearly movement is important for the long-term existence of any population," he says.
