This timeline excludes a few technologies that might seem obvious choices, but they appeared before 1982. The Internet, for instance, was designed in 1974, though it did not open up until the 1980s. Personal digital assistants first appeared in 1975. TCP/IP goes back to the 1970s. Even in a time of accelerated technology advancements, innovations take time to gestate — wikis, which have caught fire in recent years, date to 1995!