<i>By analogy, it&#x27;s like saying we know conceptually what a Turing machine is and how it works, but not everything about computer science and software engineering.</i><p>That&#x27;s reverse of what he is saying. As you say, we understand the Turing machine (the most basic elements), but we don&#x27;t understand everything it implies.<p>Whereas in physics, we don&#x27;t understand the most basic elements, but we do understand what those elements imply (at least, the article asserts that we do).