A rescue tool is for use with emergency extrications from a structure. The method further consists of measuring a voltage drop on the capacitor over the discharge period and determining the impedance of the tissue responsive to the potential, the voltage drop, and the discharge period. In another embodiment additional content can be selected. The rolling roller is disposed in contact with the rolling curved surfaces. In some instances, the equity ratio may be based upon the amount of equity projected to be owned by the target date fund upon the target retirement date.