Educational apps

You cannot see what I see, because you see what you see. You cannot know what I know, because you know what you know. What I see and what I know cannot be added to what you see and what you know, because they are not of the same kind. Neither can it replace what you see and what you know, because that would be to replace you, yourself. Everything you see or hear or experience in any way at all is specific to you. You create a universe by perceiving it. So, everything in the universe you perceive is specific to you. - Douglas Adams