Ключевые слова: bio, biochemistry, biogenic, biology, brain, catch, chemical, chemistry, compound, concentration, depression, dopamine, drug, education, emotion, euphoria, feeling, fingers, formula, hand, happy, health, hold, hormone, human, hydrogen, illustration, laboratory, medical, medicine, metabolism, molecular, molecule, mood, nitrogen, organic, pattern, physiology, school, science, scientific, sign, steroid, structural, structure, substance, symbol, system, therapy,