In my last post on artificial intelligence, I deferred to Robin Hanson on his claim that strong AI achieved through brain emulation is far easier than weak AI based on manual programming in order to focus on my core claim that weak AI is preferable for behavioral reasons. Robin worked in the 80s as an AI researcher at Lockheed and in the early 90s as a researcher for NASA, so he clearly has more expertise than I do on the question of what is feasible in the field.