Part of a series: 1. (Experimental design and variables - first #19), 2. (#20 - Retinoids), 3. (#21 - History of Psych drug use); about experimental design for a multi-factorial problem - FAS and ADHD and an increased risk for schizophrenia (schizoaffective disorders) which can lead to an increased risk for developing Alzheimer’s dementia later in life. What do they all have in common?