Selective breeding favored genes for reduced height, because they came along with genes for increasing yields to feed a growing population.
“现在，如果你走过小麦田，看到的小麦大概只到膝盖。
科学60秒-科学美国人 2020年7月合集
Selective breeding favored genes for reduced height, because they came along with genes for increasing yields to feed a growing population.
选择性育种有利于降低身高的基因，因为它们伴随着增加产量的基因来养活不断增长的人口。
英语百科
Pythagoras number
In mathematics, the Pythagoras number or reduced height of a field describes the structure of the set of squares in the field. The Pythagoras number p(K) of a field K is the smallest positive integer p such that every sum of squares in K is a sum of p squares.