其实想想如果都是高个父母生出来的小孩是不是还是更高个，那么为啥现在人类平均男的还是1.7女的还是1.6？ 然后从身高联想到智商 会不会一样道理呢？ 
https://ourworldindata.org/human-height
Will growth resume in the future?
Improvements in environmental factors such as nutrition and health could result in further increases in average heights. However, the factors that influence height have an upper limit: nutrient intake, for example, likely has limits above which benefits stop. As such, it’s possible that heights – particularly in countries where living standards are still relatively low – can further increase. But for the richest and tallest countries in the world today, heights may have reached their limit.
