"dirty jobs" mike rowe learned all about the hard working men and women keeping america running. he found there was a disconnect between unemployment and dirty jobs. >> everywhere i went i saw help wanted signs and everybody i talked to said how hard it was to find people to retool and retrain and learn a truly useful school and apply it. and microworks evolved to shine a light for jobs going for whatever reason unloved and set up a foundation and began to award work ethic scholarships. >> reporter: rowe travels the country to get his message outside. this is the biggest s.t.e.m. event in the country. people love acronyms. and science, technology, engineering and math will keep the country competitive. it ought to be s.t.e.m.s. if you take the skill out of any of those disciplines, what do you have?