> gets built using this information only

No they don't. There is plenty of external stimuli that also serves as input, e.g. the process of raising a child and complex thoughts that may only be transferred from grown human to grown human.

Try raising a human in a barren cell without human contact or as part of a pack of wolfs and you'll see how much a human brain is built from "DNA only".

Certainly, and I don't think anyone really doubts this.

Still, people are sometimes surprised by how DNA may affect more parts of behavior than they previously thought.

Not necessarily by directly coding for the behavior. In many cases, the DNA will just modulate how we learn from the environment. And if the environment is fairly constant, observed behavior can correlate more strongly with DNA that one might have expected.

Yeah compared to animals we have a lot of extra bootstrapping outside of physics/chemistry alone via culture and stored information similar to how cell DNA bootsraps via physics, human mind boostraps via stored information in human "network" (talking, internet, books) after being born.

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