iq is "polygenetic" with the consensus estimates at 50-80% based on genes

success has components of luck as in "right place, right time" for someone with the right qualities and connections, and many of the very successful are quick to admit this

I am a 3rd generation machinist along the paternal line, and although the machines I operate are in expensive labs, those my father and grandfather operated were probably just as challenging. Engineering also seems to often run in the family. How much is nature and nuture? "It varies" is a safe response