Kaku talks about evolution of brain structure, with human brains distinguished by pre-frontal cortex - the seat of rational thinking. Then jumps to talk about "consciousness" as a "mysterious object". This already dismisses the entire mind/brain discussion/debate.
The key question is whether science's limiting to the study of "objects" can actually fully deal with the question of "consciousness" or "awareness" - a subjective, non-material realm (other than ignore or dismiss it). There are many interesting contributions to the study of consciousness in brain science, but it remains questionable whether scientific study can completely unravel or explain consciousness without missing the most important aspects. Maybe "you can't get here from there", but it is fascinating to try.