Takao Hensch, professor of molecular and cellular biology at Harvard University, believes that absolute pitch — the ability to identify or sing a specific note without any reference points — is a learned ability, normally only acquirable by humans in a critical period early in our lives. In the past, Hensch and other scientists believed, if we missed the window and hadnt gained the ability to pick out or produce a note at will by the time we were around seven years old, we wouldnt ever be able to master the skill as adults. But a new study co-authored by Hensch claims that a drug gives humans the ability to learn perfect pitch, long after critical period has closed. Until now there have been no known reports of adults acquiring absolute pitch