"If we're going to be consistent and advocate freedom of speech we have to advocate freedom of encrypted speech too. The genie is out of the bottle, cryptologically."
Heinlein does not provide a description of how this propulsion system works; however, he compares it to the method still in use today:
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Mobility Scooters Go Offroad
'Noiselessly, on rubber-tired wheels, they journeyed down the long aisles...'
RAMST - Robotically Assembled Modular Space Telescope
'The eight thin metallic legs were pointed downwards, balanced delicately...'
Terminal Snooping At Bloomberg
'The evidence began with a slowed response at her computer terminal.'
Will There Be A Digital Afterlife?
'A quick exchange of energies resulting from the relocation of discorporate states.'
ROCKY - Resistive Overload Combined With Kinetic Yo-Yo
'Joe got out the gravity-simulator harnesses..'
China Bans Self-Driving Car Testing
Innovation hits some bumps.
Robotic Lawnmower Fulfills SciFi Homeowner's Dreams
'The mower reached the edge of the lawn, clucked to itself like a contented hen...'
7-Eleven Drone Delivers Chix Sandwich And Slurpee
'It was a smooth ovoid floating a few inches from the floor...'
Beta-Ti3Au Titanium-Gold Alloy Hardest Tissue-Compatible Metal
It needs a more science-fictional name!
Solar Plane Circles The Globe
'Tropism-like pursuit of the sun across the sky as they recharged their batteries...'
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