You can use it when your hands are sticky - like when you're in the kitchen and you need some recipes. This is not a really good sign, because when Apple was trying to sell Apple II+ computers in 1979, they tried to get people to think that they would use them to store recipes. But anyway. Take a look at this demo video, which actually does have some interesting ideas.
A loud clatter of gunk music flooded through the Heart of Gold cabin as Zaphod searched the sub-etha radio wave bands for news of himself. The machine was rather difficult to operate. For years radios had been operated by means of pressing buttons and turning dials; then as the technology became more sophisticated the controls were made touch-sensitive--you merely had to brush the panels with your fingers; now all you had to do was wave your hand in the general direction of the components and hope. It saved a lot of muscular expenditure, of course, but meant that you had to sit infuriatingly still if you wanted to keep listening to the same program.
Zaphod waved a hand and the channel switched again.
AI Worms That Spread
'...there were so many worms and counterworms loose in the data-net now' - John Brunner, 1975.
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Humanoid Robots Building Humanoid Robots
''Pardon me, Struthers,' he broke in suddenly... 'haven't you a section of the factory where only robot labor is employed?''
Stratospheric Solar Geoengineering From Harvard
'Pina2bo would have to operate full blast for many years to put as much SO2 into the stratosphere as its namesake had done in a few minutes.'