9 Educational scientific apparatus, namely, calculators, microscope slide sets, science activity kits consisting primarily of scientific and laboratory equipment in the nature of spring scales, thermometers, magnifying lenses, balloons, nuts, bolts, screws, straws, rubber bands, spools, eyedroppers, funnels, protractors, rulers, balloons, maps, table tennis balls, washers, straws, and disk counters and instruction manuals sold as a unit therewith relating to weather, geology, ecology, physics, measurement, chemistry, life sciences, anatomy, scientific research and discoveries, geography, optics, mechanics, electricity, light and sound, biology and magnetism