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Blue Sky Department

Ideas are easy. Making them work is the hard part.

Properties of a Finite Universe
Edges of the Universe
Speculations on Negative Mass

Fractal Manifold - A Design for 3D Printing.
Magnetic Flywheel - A Sub-relativistic Flywheel Design.

Compression as Encryption

Reuseable Launch Vehicles
Beyond Chemical Rockets - Nuclear, laser and microwave powered rockets.
Tethered Interplanetary Vehicles - Nuclear powered manned space travel.
On the technology from the fiction of C.J. Cherryh