Ключевые слова: art, atom, background, bacteria, beaker, chemistry, color, colorful, contour, danger, education, equipment, flask, formula, glass, hand, hazard, icon, illustration, infection, isolated, library, line, linear, literature, location, math, mathematical, mathematics, microbe, molecular, molecule, open, outline, pin, pop, popart, radiation, school, science, set, sign, square, stone, symbol, toxic, x,