The Guinness world record for typing speed was held by the late Barbara Blackburn. There are two kinds of typing contests: sprints, and marathons. And Barbara was a champion of both: During minute-long speed tests, Barbara could type up to 170 wpm on typewriter or, on a computer, 212 words per minute.

MARTIN AUSTWICK: 212 words per minute

HZ: And in endurance tests she could type 150wpm for 50 minutes.

MARTIN AUSTWICK: 150 words per minute, for 50 minutes

HZ: To show off her world record-breaking achievement, in 1985 Barbara was invited onto the David Letterman show, to race against the fastest typist on Letterman show staff - also called Barbara. But Barbara Blackburn sabotaged the contest.