Ключевые слова: anxiety, art, atom, biochemistry, biology, blue, brain, chart, chemical, chemistry, clipart, concept, design, doctor, education, element, flat, formula, good mood, happiness, health, hexagon, hormone, icon, illustration, isolated, joy, laboratory, medication, medicine, molecular, molecule, morning, outline, pharmaceutical, pharmacy, physiology, positive, school, science, sign, simplicity, sleep, structure, studying, symbol, wellbeing, yellow,