Scientists have hypothesized about bipedalism in apes but have not really studied the evolution of kangaroos who can walk/hop upright.<quoted text>
This goes back to basic evolution. Accept it or don't. Human bipedalism began in the days of ardipithicus, and refined itself through the last 4 million years.
I only suggest the animal reference because I think that animal algorithms do exist as overlays to a core human psyche. I've already posted on the subject. I don't think you'll find such things among the traditional Caucasian populations because they are psychological extroverts who aren't very stable when contending with mixed feelings. It would take some time to explain.
I simply don't consider "spirits" to exist, and the psyche just is not separate from anatomy. People don't like things to be reduced to algorithms and a set of experiences, but that is the nature of things anyway.
Intelligence, personalities, and disorders can be affected by biological, psychological and environmental factors. For example, Bipolar Disorders are more prevalent among Caucasians than other races such as Asians who are more reserved. But anyone can be both extrovert and introvert depending on the situation. It's just that our cultures dictate what is supposed to be the norm and what is deviant. In most parts of Asia, people don't separate kids with learning disabilities from the normal ones like how Americans put them in special ed class. I am not sure if that's a good thing or not.