Another short reply to Drogue:
Unfortunately I do not know any researches or statistics about the strength of the correlations between parents' and children's talents. But if your theory would be true, the nobility of the 18th century should be better rulers than the nobility of the 8th century. Somehow I doubt this is true.
Well, it doesn't mean always passed on, but there is a strong correlation between attributes of the parents and those of the children.
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