Given the rarity of such expert in any/all field, I'd dare say it's more like nature instead of nurture. The best we can nurture is 'good' analogy, that still

Given the rarity of such expert in any/all field, I'd dare say it's more like nature instead of nurture. The best we can nurture is 'good' analogy, that still somewhat valid even if the analogy is expanded further p/s: If only we have a list of Feynman-like experts in most of the fields :D