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外露的睾丸，是人类最严重的演化失误？
source link: https://tech.sina.com.cn/d/i/2018-06-20/doc-iheauxvz4495133.shtml
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演化是一个持续进行的过程，所以不难理解，人体的一些特征远未达最佳状态。而在这些特征中最明显也是最难解释的，就是长在外部的睾丸。从演化的立场来说，睾丸毕竟是男性最重要的东西。没有睾丸，人类也就无法延续下去了。可它们就这样脆弱地敞露在外，毫无遮
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