The ABO system consists of A, B, AB, and O blood types. People with type A have antibodies in the blood against type B. People with type B have antibodies in the blood against type A. People with AB have no anti-A or anti-B antibodies.
Developmental dyslexia, or specific reading disability, is a disorder in which children with normal intelligence and sensory abilities show learning deficits for reading.
Dyslexia (litteraly Dys=difficulty lexia=reading)is frequently related to inhomogeneous brain dominance and abnormal spacial perception. A right handed child ,normally kicks a ball with his right foot,aims with his right eye and uses his right ear to listen a soft sound.