About this episode
美国西奈山医学院环境医学和公共卫生学教授 Shanna Swan 2017 年发表于《人类生殖医学前沿》的荟萃分析中写道：男性精子数量在仅仅 40 年间就降低了 50%。如果这一趋势得不到扭转，那么 25 年后人类男性精子数量的中位数将跌至零。尽管这是一种简单粗暴的推测，但是未来人类的生育问题或许真的需要我们警醒。
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