Professor Cuthbert Calculus is a fictional character in The Adventures of Tintin, the comics series by Belgian cartoonist Hergé. He is Tintin's friend, an absent-minded professor and half-deaf physicist, who invents many sophisticated devices used in the series, such as a one-person shark-shaped submarine, the Moon rocket, and an ultrasound weapon. Calculus's deafness is a frequent source of humour, as he repeats back what he thinks he has heard, usually in the most unlikely words possible. He does not admit to being near-deaf and insists he is only slightly hard of hearing in one ear, occasionally making use of an ear trumpet to hear better.