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I was watching some early Star Trek TNG the other day and it hit me how the communicator system they have looks very much like wifi. It's wireless and can be accessed by tiny wearable devices, and it has locators in it much like what we would call GPS. The common issue they had where 'interference' of some kind would block the communicators, or where they would be 'out of communicator range' is the same as having weak wifi signals or being our of wifi range. And of course, there were the iPad-esque tablet devices on which they would read documents and do their data collection and other work...
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