
Ted Kaczynski, the Unabomber, died on Saturday at the age of 81. Kaczynski was a mathematics professor who turned to terrorism in the 1970s and 1980s, sending mail bombs to universities, airlines, and other targets. He killed three people and injured 23 others. Kaczynski was arrested in 1996 and pleaded guilty to his crimes. He was sentenced to life in prison.