I suspect that most people will name “soul” as the main difference between animals and humans. They will not be able to define what it is, but it is still a basis for the difference. Now, let’s look at the evolutionary steps: inorganic (minerals) to organic (up to animals) to consciousness (humans) to X (Read Ishmael to find out why there is X). Humans redefine rules of evolution (natural selection does not apply any more), but evolution shall continue (why would it stop?). It seems to me that we are stepping into “soul evolution”, or whatever you want to call it, stage. Animals could not develop brains without presence of required organic molecules. When these molecules became available, brain was developed and used to advance the evolution. The next stop is soul development. There is no point to make it more esoteric than it is, instead it is reasonable to find a rationale behind this progression. The only problem is that souls do not live in four dimensions that we live in. The other dimensions (if any) must be understood, before their inhabitants can be met. It seems that souls will not be available until a human has reached certain level of awareness. And this is a circular argument: no awareness – no soul is visible, no soul is visible – no need to develop awareness. On the bright side, animals did not become aware of the brains, until they started to use it. We will see if we have the time to use this approach.