Safe, stable, non-toxic and recyclable cooling compositions comprising solid particulate compounds that undergo an endothermic process when mixed with water such that the resulting mixture is useful for cooling surfaces, liquids and solids. The chassis has a cab end and a rear end. The casing defines two opposite guiding holes for the supporting pole extending through. The processor adjusts the characteristic of the signal by adjusting at least one of a current and a voltage of the transmitter when the characteristic of the signal is outside a predetermined range. Such assessment can be made by comparing a fluorescence anisotropy profile with a known profile of a control. Using telemetry devices attached to a patient, relative measurements of the positions and orientations of the patient’s bones may be determined.