In 1991 scientist Richard Lynn wrote:
A useful source for evaluating the contributions of the human races to scientific and technological achievements is available in Asimov’s (1989) Chronology of Science and Discovery. This lists approximately 1,500 of the most important scientific and technological discoveries and inventions which have ever been made. The first three are bipedality the manufacture of stone tools and the use of fire which antedate the evolution of the races. Thereafter every single invention and discovery was made by the Caucasian or Mongoloid peoples. This compilation confirms the historical record. Who can doubt that the Caucasoids and the Mongoloids are the only two races that have made any significant contribution to civilization.
This is powerful evidence that racial differences in intelligence have existed for tens of thousands of years, across both time and space, contradicting the “reaction norms” argument by HBD denyers who say racial “intelligence” differences are environment dependent.