On this day in 1973, a bank robbery in Stockholm, Sweden, turned into a hostage crisis; over the next five days the hostages began to sympathize with their captors, leading to the term "Stockholm syndrome".
On this day in 1990, West Germany and East Germany announced that they would reunite on October 3.
On this day in 1991, Tim Berners-Lee opened the World Wide Web (WWW) to new users.