Although the University had previously refused to let his father enroll him at age 9 because he was still a child, Sidis set a record in 1909 by becoming the youngest person to enroll at Harvard University. In early 1910, Sidis' mastery of higher mathematics was such that he lectured the Harvard Mathematical Club on four-dimensional bodies which brought him nationwide attention. Notable child prodigy, cybernetics pioneer Norbert Wiener, who also attended Harvard at the time and knew Sidis later stated in his book "Ex-Prodigy": "The talk would have done credit to a first or second-year graduate student of any age...talk represented the triumph of the unaided efforts of a very brilliant child." MIT physics professor Daniel F. Comstock was full of praises: "Karl Friedrich Gauss is the only example in history, of all prodigies, whom Sidis resembles. I predict that young Sidis will be a great astronomical mathematician. He will evolve new theories and invent new ways of calculating astronomical phenomena. I believe he will be a great mathematician, the leader in that science in the future." Sidis began taking a full-time course load in 1910 and earned his Bachelor of Arts degree, "cum laude", on June 18, 1914, at age 16.