Ключевые слова: academic, back, board, book, books, chemical, chemist, chemistry, class, classroom, college, confused, discovery, education, evening, exam, experiment, experimenting, flask, fluid, glass, graduation, homeschooling, late, learning, man, night, preparation, preparing, puzzled, reading, research, scared, school, science, solution, student, study, studying, substance, surprised, test, textbook, textbooks, to, trainee, training, university, unsuccessful, whiteboard,