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New technologies
Grind the Asteroid, Print the Part
Why there will never be a steel mill in space, and what replaces it
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New technologies
Powder or Wire
The two ways to print metal, why neither one is ready for the Belt, and the questions somebody has to answer first
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New technologies
Built for Earth, or Built for Something Bigger?
The tools a colony needs are being perfected right now, by people who say they are building them for us
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New technologies
A Thousand Garages
Before there is a printer in space, there has to be a shipyard on the ground, and the shipyard does not have to be in one place
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New technologies
Thirty Thousand Volts and a Piece of Tin Foil
I drove an hour and a half to call a man a liar. He turned on a computer monitor instead, and I have been thinking about it for twenty years.
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New technologies
Out the Side of the Mountain
Twenty miles of vacuum tube under a Hawaiian volcano, and a freight train that never comes back down. What a ground-based mass driver would actually take, and why it exits the flank instead of the summit.
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New technologies
That’s Not a Rocket, It’s a Freight Train
How I wired the one on my bench in 1994, the one I drew and never built, and why a mass driver runs on railroad logic, not rocket logic.
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New technologies
Cold, Vacuum, and a Hundred Thousand Joints
What geosynchronous orbit does to the ten-inch panels in "A Thousand Garages," starting with the question every steel man asks first — and one thing that article got wrong.
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New technologies
Powder or Plate
The garages stay. What's in them changes.
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