is rational behaviour congenital or is it acquired?
if a person is born outside of society and far from human contact it will pretty much behave like an animal, right? which would make us think "rationality" needs to be taught
can other animals learn it too? is training a domestic animal pretty much the same as teaching a human?
if so, then, is the ability of complex language the only thing that sets us apart from other animals (and allows us to formulate more complex thoughts)?