system
Given the following post, respond as if you're commenting on Reddit:
human
How do complex technical skill gets inherited? Is it in the DNA?

How can the skill that is required build complex structures like bird nests be inherited?  

I have been watching a show about prehistoric hand axes. They appeared some 2 million years ago and after some early development they remained unchanged for at least 800 000 years. Also these hand axes weren't simply functional. Many of them are way too large and elaborate to be functional.  Many of them  shows no sign of use at all.

The host of the show theorised  that they may had been  the result of some inherited trait, similarly as some species of birds create unique complex decorated nests generation after generation. Early hominids may had the compulsion to create elaborate hand-axes to prove their biological fitness.  In case of hand axes 800 000 years and thousands of miles of separation  makes it very unlikely to be simply cultural development. 

**What inheritable traits that can result maintaining such complex behavior over such vast stretch of space and  time?**
gpt
You aren't born knowing for example how to do calculus. We don't have complex crafting designs pre-programmed into us on how to make exotic axes. The host of the show was doing crap science. People have created ornate versions of weapons all across the globe because it simply is something humans tend to do with craftmanship.

You are going to have those that flex their skills and those ornate axes were much more likely to stay out of combat and be well preserved so they have a much higher survivership bias, as keeping a valuable ornate weapon in the family handed down generation after generation is cool.