Theodore J. Kaczynski, the so-called Unabomber, who attacked academics, businessmen and random civilians with homemade bombs from 1978 to 1995, killing three people and injuring 23 with the stated goal of bringing about the collapse of the modern social order — a violent spree that ended after what was often described as the longest and most costly manhunt in American history — died on Saturday June 10 2023. He was 81. After his arrest in April 1996, Mr. Kaczynski’s extraordinary biography emerged. He had scored 167 on an I.Q. test as a boy and entered Harvard at 16. In graduate school, at the University of Michigan, he worked in a field of mathematics so esoteric that a member of his dissertation committee estimated that only 10 or 12 people in the country understood it. By 25, he was an associate professor at the University of California, Berkeley. Then he dropped out — not just from Berkeley, but from civilization. Starting in 1971 and continuing until his arrest, he lived in a shack he built himself in rural Montana. He forsook running water, read by the light of homemade candles, stopped filing federal tax returns and subsisted on rabbits.