"This is a quiz show for fast brains and fast fingers," declares the host at the start of this 1981 edition of Granda's Think Tank. Weighty reference books pile the desks of the three competing teams of schoolchildren as they prepare to play. They all have access to a computer called 'Viewdata', an interactive information system viewed on a television monitor. Reminiscent of TV Teletext, its 200,000 pages of information are retrieved only by manually typing in index numbers on a keypad - a much slower process than the search engines we're all used to.

What follows is similar to many educational television quizzes such as University Challenge: questions are asked by the presenter and the contestants must answer quickly. The difference with Think Tank is that the competitors have all of the answers to the questions in front of them - they just have to find them. Cue lots of frantic scrabbling through volumes of reference books. All traditional school subjects are covered, with the addition of music, video and newsreel rounds.

Tension builds with thrumming music, electronic buzzers and an impatient quizmaster. The pace is brisk and contenders don't have long to find the answers but somehow they do. Try playing along by searching for the answers online. Impressively, the students often get there before Google can.