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Studies involving identical and fraternal twins (even reared apart) showed that most parts of our nature are partly heritable. Intelligence may be as high as 80% heritable, but 50% is the standard number of many of the domains, including personality.
However, being heritable isn't the same as being fixed. There might be a difference between inheriting different capabilities versus different preferences.
MORE IDEAS FROM THE SAME ARTICLE
While genetic research stands out in favour of rigidity, there is contrary evidence.
How much we can change ourselves can be explored by looking at the extremes.
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