But who is random joe? It was craftsmen, merchants, and artists who invented things or philosophers and priests who tried to figure out the world around them. Scientists for science's sake is relatively recent. The Average Joe (or, at least, some kind of individual who specialized in something besides science) were the ones that came up with the greatest breakthroughs in Science. This isn't even counting non-technological techs that just developed naturally (no scientist invented Civil Service or Chivalry).