Are athletes really getting faster, better, stronger? | David Epstein

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公开考题拿了高分，换道新题还会吗？ →一张排行榜能帮你挑出值得试的模型。要判断它能否解决你手上的问题，还得知道那些分数是怎么来的。本片参与的问题 · 两代人的分数差，是人变了还是题变熟了？

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David Epstein 比较不同时代的赛跑纪录时，把跑道材料放回计算。他将专家给出的煤渣跑道减速估计用于现代成绩，说明跨代比较还混入了器材和场地变化。

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So I consulted biomechanics experts to find out how much slower it is to run on cinders than synthetic tracks, and their consensus that it's one and a half percent slower.

So if you apply a one and a half percent slowdown conversion to every man who ran his sub-four mile on a synthetic track, this is what happens.

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