Colour blindness, about which very little is known, is hereditary and affects boys to a greater degree than girls. At the same time, people who are colour blind are generally above the average in intelligence.
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https://paperspast.natlib.govt.nz/newspapers/TS19330318.2.228
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Star (Christchurch), Volume XLIV, Issue 714, 18 March 1933, Page 27 (Supplement)
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35Untitled Star (Christchurch), Volume XLIV, Issue 714, 18 March 1933, Page 27 (Supplement)
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