The most contentious subject is consciousness. People can be empowered by new understanding or scared by it. Denial is the default setting for all brains. We usually ignore 99% of what we perceive. Perception and consciousness are separate systems and are united only when the entire brain is fully involved. So you only really see 1% of your visual field, the rest is an illusion created by the brain. Your eyes move 3 times a second and sample different areas 1% at a time. Colors are the last to be interpreted in areas forward from the rear occipital areas. Compromises are made by the brain when background colors are compared. Thats why the blue dress looked gold to some but not others. Who is the boss of your brain is the question that can be most challenging to many people. WE'LL GO THERE NEXT.
For Dave: It is forever true regarding the fact that some information may be new to you but not others and vice versa.