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Walker, Jearl – Scientific American, 1980
Described is a way for an amateur to build a mercury-vapor ion laser which was devised by Dean Morelli. Morelli's laser emits bright pulses of green light and dimmer pulses of red-orange light and is the first gaseous-ion laser. (Author/DS)
Descriptors: College Science, Construction (Process), Higher Education, Lasers
Fodor, Jerry A. – Scientific American, 1981
Describes several different philosophies of mind with each philosophy's explanation of the mind-body problem. Philosophies discussed include dualism, materialism, functionalism, radical behaviorism, logical behaviorism and central-state identity. (DS)
Descriptors: Electronics, Energy, Higher Education, Lasers
Walker, Jearl – Scientific American, 1980
Provides information regarding the extra bands of color, termed supernumerary arcs, that sometimes accompany a natural rainbow. Several experiments are described that elucidate the phenomenon of supernumerary arcs, involving the illumination of a hanging water droplet with white light from a projector or monochromatic light from a helium-neon…
Descriptors: College Science, Color, Higher Education, Lasers
