Few “racial” issues are as politically charged as the U.S. Black/White test-score gap. Over the past two decades, scientists have amassed a wealth of data about the phenomenon. And yet despite their findings, many American political and academic leaders continue to ignore reality and espouse counterproductive solutions to non-existent problems based on discredited theories. Conservatives claim that the gap is caused by the childhood peer pressure of Black oppositional culture. The evidence contradicts this notion. Liberals claim that it is due to class differences. The evidence contradicts this also. Many on both sides insist that the gap is at least partly genetic. This notion has been the most thoroughly demolished of all. The U.S. Black/White test-score gap is a topic where facts are ignored by powerless and powerful alike, by unlearned and academics alike, and by conservatives and liberals alike. The only people who admit to being baffled by the phenomenon are scientists who have spent years studying it. Here are the known facts about the U.S. Black/White test-score gap for those more interested in reality than in ideology.