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The study involved gene sequencing carried out on 6,500 Americans of both African and European heritage. Some 73 per cent of the rare (occurring in less than 0.1 per cent of the sample) variations had occurred during the last 5,000 years.
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So humanity is especially riddled with mutants (or mutier-than-normal people: everyone carries at least some mutations compared to their parents), and set to get more so. This could mean health problems - but it could also mean the future appearance of people who are truly unusual in a good (or very strange) way.