Fluids: Circulation of the blood, blood pressure, power produced by heart. Heat: transfer of heat, transport of molecules by diffusion, respiratory system, surfactants and breathing, diffusion and contact lenses. Thermodynamics of living systems, energy from food, regulation of body temperature, evaporation, resistance to cold, heat and soil. Sound: hearing and the ear, clinical uses of sound, ultrasonic waves. Electricity: the nervous system, electricity in plants, electricity in bone, electric fish, electrocardiograph, physiological effects of electricity, sensory aids. Optics: structure of the eye, accommodation, eye and the camera, retina, defects in vision, fiber optics. X-rays: computerized tomography CT. Lasers: lasers surgery. Nuclear Physics: magnetic resonance imaging, radiation therapy, food preservation by radiation, isotopic tracers.