只有在平坦的宇宙中，空间才符合标准的几何规律——三角形的内角和精确地等于180度，平行线永远不相交。
Only in a flat universe does space obey all the standard geometry-class rules-the angles of a triangle add up to exactly 180 degrees and parallel lines never meet.
通过使用新的分析技术，埃雷兹·李伯曼和他的同事发现，基因组片段紧密地构成了一个“分形球”（译注：想象一下由面条揉成的球），尽管基因组片段相互扭曲纠缠，但它们之间却没有节点（译注：也就是面条球里的每根面条都不相交）。
Using new analytic techniques, Erez Lieberman and colleagues found that the genome is packed into what’s called a “fractal globule”—despite being intensely twisted, the string of genes never knots.
PLS算子通过聚类分析将种群分割为互不相交的邻域子种群，对每一个子种群应用单纯形法进行并行局部搜索。
PLS partitions the population into a group of disjoint subpopulations by cluster analysis, then USES simplex method to search local optima in each subpopulation in parallel.
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