Skills and crafts - where did they come from?

 Radak (Bereishis 4:22) This story teaches us that all crafts and technical skills are not part of the human nature of the early humans that they would automatically realize them by intellectual effort and reasoning. The fact is that each of these humans was born with a different nature and each one was born with a predisposition to a particular skill and craft. They each had a desire to practice that skill and wisdom when they grew up. They naturally and easily acquired that skill much faster than others.