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Gulf by Robert Heinlein:
Science Fiction Inventions, Technology and Ideas
"The enemy warded those films , and they were playing for keeps, with no holds or costs barred. The government agent had to gel them through. But — where did the fat man with the talking cards fit in...?"
"Supermen they might be, super criminals perhaps — but the game they played meant the thin edge of death for them and life for a world."
A novella first published in Astounding in 1949, then collected in Assignment in Eternity. In the story, geniuses band together and develop better ways to think and then speak more quickly and more accurately. The "gulf" in the title refers to the difference between ordinary men and the supermen of the future.

('Gulf' by Robert Heinlein)
Select
an invention:
'Fresher Short for 'refreshing chamber', a device that performs various personal services.
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Sound Analysis Improving language teaching by showing the waveform of a spoken word or phrase, and comparing it to standard speech.
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Speedtalk A constructed language that uses a single sound to stand for a word, achieving great improvements in communication speed.
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