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"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."
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![]() As far as I know, this is the first use of hydroponics in modern science fiction.
The basic idea for hydroponics has been around since at least 1627, described in Francis Bacon's Sylva Sylvarum or 'A Natural History.
If you think you remember it from Robert Heinlein's 1941 Methuselah's Children, you're right.
The New Frontiers was approximately cylindrical. When not under acceleration, she was spun on her axis to give pseudo-weight to passengers near the outer skin of the ship; the outer or “lower” compartments were living quarters while the innermost or “upper” compartments were storerooms and so forth. ‘Tween compartments were shops, hydroponic farms and such. Along the axis, fore to aft, were the control room, the converter, and the main drive.
It's an idea that gets around; you'll even find it in fantasy. In Barbara Hambly's Darwath series, for example, the Keep that allows human beings to survive the Dark:
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