Alright, to someone who lived in the times of 1596-1650, I think that this Descartes fellow had some really interesting and thought provoking ideas. At that time, it was a basis that the mind and body were the two main substances and that they did intertwine, however could stand alone. Physically and biologically, we now know that the mind is not an “animal spirit” and involves a little more with the neurons, penal glands and electricity that previous Descartes thought.