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What did classic sci-fi tout as so high tech back then but was really simple to actually make?
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Were there any examples of things we thought would be very hard to do in sci fi and requiring advanced technology BUT wasn’t so hard to actually do in real life?

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Quad copter drones just don't exist in sci-fi older than this site despite the quadcopter design being really, really ancient. It's actually pretty crazy.

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7 months ago