context: Harold Kelp, the grandson of professor Julius Kelp, is a young inventor who struggles with his experiments. He is frequently attacked in his visions by his fear, which takes the form of a big, black monster. After encountering an angry mob involved in Harold's bad inventions, Harold is sent away to a science academy run by his grandfather.
  Upon his arrival, Harold meets a beautiful girl named Polly McGregor and becomes enamoured with her. Wanting to impress her, Harold gets his hands on his grandfather's secret elixir, the Secrets of Love, which he believes will get him girls. He drinks it, unleashing his cooler, hipper alter ego Jack, who causes mischief.
  Jack starts out popular with the students, but his behavior and ego get out of hand. Also, because of Jack, Harold is failing classes. When he learns of Harold's problem, Julius transforms into Buddy Love to teach Harold to be himself. Later on, Harold's fear is accidentally brought to life by one of Julius' inventions, but he manages to kill it by facing it.
  Then, Jack says good-bye to Harold and disappears into him, leaving Harold to share a kiss with Polly.
question: what kind of formula did Professor Kelp create?
answer: Secrets of life