A blood sample contained in a sample container is separated into a serum and a clot by a separating medium. The present invention employs a large motor that can assist a rider at slower speeds but limits the amount of power that the motor can produce at greater speeds. The media also stores instructions for detecting complexities in the model, the complexities related to the selected location and presenting information about a source for at least one of the complexities. The organic solvent may be one that comprises 40% or more of a saturated hydrocarbon. The arms may be affixed to one another in the front using hook and loop, stretchable band or straps or other fasteners.