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Believing in race can be compared to believing in astrology. People who have faith in astrology find constant confirmation that horoscope predictions are reliable and that astrological signs determine personality types. For the faithful, the twelve divisions of the zodiac are as accurate as Blumenbach’s five divisions of human beings. The funny thing is, biostatisticians can find significant medical differences according to astrological signs. In the 1990s, a major randomized clinical trial compared the effectiveness of an intravenous drug, an oral aspirin, and a placebo to treat 17,000 patients who were hospitalized with signs of a heart attack. The study found a huge overall statistical benefit for patients who got the aspirin over the placebo. To test the strength of the outcome, the researchers divided the patients into twelve subgroups by their astrological signs. They found that the zodiac made a difference: their statistical analysis showed that patients born under Gemini or Libra suffered an adverse effect from aspirin.72 Unsurprisingly, physicians laughed off this finding because it was more scientifically plausible to interpret the results as an insignificant coincidence. But an astrology enthusiast would take it as proof that zodiac signs determine people’s health and drug response.
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Dorothy Roberts (Fatal Invention: How Science, Politics, and Big Business Re-create Race in the Twenty-First Century)