Unlike humans, some birds have independently evolved to flourish on sugar-rich nectar &fruit without ill effect. In a new Science study, researchers find that these bird species share convergent evolutionary changes in key physiological traits and metabolic genes that enable their high-sugar diets.

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Fixing the semicircle in advance ignores configurations where the points do cluster together, just not around the chosen anchor. The real question is whether some point is a valid anchor. That is a much more generous condition.

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Author(s): Yoshiyasu Takefuji。关于这个话题，PDF资料提供了深入分析

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