The main thing Kurzweil has missed is the even though we something like the 'source code' for a human brain, we don't have the compiler. If you're taking the (

The main thing Kurzweil has missed is the even though we something like the 'source code' for a human brain, we don't have the compiler. If you're taking the (pretty weak) 'source code' analogy further, the compiler is... A host human embryonic cell, running on a womb in a mother. So thinking about the problem that way is a non-starter for obvious chicken/egg reasons.