The Scientific Method (Controlling the Variables)
Where people in general fail in their ability to think critically or scientifically is in the area of controls. Endless cause and effect errors and wrong conclusions have resulted because of our failure to consider the many variables in a situation. Testimonials, anecdotes and biased data gathering make up the evidential backbone of pseudoscience, paranormal beliefs, religions and quackery. But testimonials and anecdotes do not a science make.