I think it's a good idea that knowledge workers learn the fundamentals of at least one trade. I am interested in HVAC and building automation. You can also mas

I think it's a good idea that knowledge workers learn the fundamentals of at least one trade. I am interested in HVAC and building automation. You can also master a trade and become a knowledge worker. Here in Denmark it's possible to mix pre-university/gymnasium (equivalent to year 10-12 in the US) with a trade. Combined it takes 4.5-5 years.