If the "Out of Africa" hypothesis is right, that decreasing variability should be reflected in skull shape-since this is ultimately under genetic control.

如果“走出非洲”说是正确的，那么趋同性应该在头骨上有所体现——因为它主要是由基因控制的。

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Psychologists have found that a substantial factor accounting for this variability is the perceived degree of control that people have over their daily lives.

心理学家们已经发现了能解释这个差异的一个重要因素，那就是人们在日常生活中对控制能力的认知度。

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For them, enhanced control of water will become critical in building resilience to increased climate variability.

面对变化不断加剧的气候，提高水资源控制利用水平，增强应对能力对他们而言变得越来越重要了。

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Because there is tremendous variability in manufacturing and quality control standards from company to company, choosing an effective product can be challenging.

CNN: How can I pick the healthiest brand of red yeast rice?

Heart-rate variability, says Dr Stein, is a good index of the degree of control an individual has over his autonomic nervous system (which controls many of the internal organs).

ECONOMIST: Diet and behaviour

This is nearly impossible given the variability of demand (at the mercy of fuel prices and the economy) and the limited control train operators have over costs, which continue to rise steadily.

ECONOMIST: Another humiliation for the government