Scientists know this may be difficult for some people to accept. As summed up by Jonathan Marks, a University of California at Berkeley anthropologist, "Teaching that racial categories lack biological validity can be as much of a challenge as teaching in the seventeenth century that the earth goes around the sun."

科学家也知道这种理论很难为一些人所接受。正如加州大学伯克利分校的人类学家乔纳森·马克斯所概括的，“宣扬种族分类缺乏生物学依据所具有的挑战性，绝不逊于在17 世纪宣扬地球是绕着太阳运行的”。

(短文节选,本篇始于：性命“忧”关 )