Doctor here- The heritability of intelligence is 80%. Here's a review article from molecular psychiatry: http://www.nature.com/mp/journal/v20/n1/full/mp2014105a.html. Also, wikipedia managed to have an entire article on it despite there being "no scientific evidence": https://en.wikipedia.org/wiki/Heritability_of_IQ.
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How do you define intelligence? Different IQ tests give different results of one person's IQ.
p.s. According to one such IQ test, Mark Karpeles had high IQ and he used to boast about it.