Following is a nice interview by Charlie Rose, of Nathan Myhrvold, which I think clearly illustrates the iconic (brilliant) Inventor Rational.
Nathan said his mom tells that he announced "at two years old" he wanted to be a scientist. If you are wondering about some evidence regarding "inborn" temperament, this might be one of the more clearer anecdotes regarding how early Temperament appears.
An Interview of Nathan Myhrvold


