Both willpower and natural talent are traits that people assign to someone after the fact: Jason is an incredible tennis player, so he must have been born with this natural talent. Jackie practiced the violin for years, several hours each day, so she must have incredible willpower. In neither case can we make this determination ahead of time with any likelihood of being right, and in neither case has anyone ever identified any genes that underlie these supposed innate characteristics, so there is no more scientific evidence for the existence of individual genes that determine willpower than
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