a human can learn anything, just tell him about the subject. There has never been any evidence of any human not being able to learn a given subject or concept

a human can learn anything, just tell him about the subject. There has never been any evidence of any human not being able to learn a given subject or concept or rule, given ample time and resources to learn it? Have you heard of Piaget? http://en.wikipedia.org/wiki/Conservation_(psychology) http://en.wikipedia.org/wiki/Conservation_(psychology) Preoperational children have an inability to conserve liquid volume. If you give a preoperational child a glass of milk in a tall, thin glass, they will think they have more milk than if it were in a short, fat glass. The child will focus only on the dimensions of the glass, not on the volume of the liquid inside. [...] this confusion [is] born from a pre-operational child’s inability to understand the notion of reversibility; the ability to see the reversal of a physical transformation as well as the transformation itself.