Only hazards related to higher risk (handguns, nuclear power, smoking ,motorcycles and X-ray) in table 1 are plotted (red points) although 81 hazards is plotted in the original graph base on factor analysis. The highest and the lowest unknown risk and the lowest dread risk also are plotted (blue points). The horizontal line indicates dread risk which is defined at its high (right hand) end by perceived lack of control, dread, catastrophic potential, fatal consequences, and the inequitable distribution of risks and benefits. The vertical line indicates unknown risk which is defined at its high end by hazards judged to be an observable, unknown, new, and delayed in their manifestation of harm. The figure is cited from Slovic P (1987) and modified.