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He skipped two grades, graduating from high school in 1958 and entering Harvard at the age of 16, majoring in mathematics. While a student at Harvard, Kaczynski participated in psychological experiments. In an article  (http://www.nytimes.com/2005/03/31/science/31hitler.html) about a long-ignored personality profile of Adolf Hitler written by Dr. Henry A. Murray for the Office of Strategic Services (O.S.S.) during World War II, it says: "Dr. Murray himself was a controversial figure. Having returned to Harvard after the war, he was involved in psychological experiments in 1959–1962 in which a stress test similar to one the O.S.S. had used to assess recruits was administered to student volunteers. Among them was the young Theodore J. Kaczynski, a precocious student at Harvard who later became known as the Unabomber. Lawyers for Mr. Kaczynski, who pleaded guilty in 1998 to letter bomb attacks that killed 3 people and wounded 28 others, traced some of his emotional instability and fear of mind control to those tests." In 1962 Kaczynski graduated from Harvard.