The author brings up several theories on propulsion(and orbits), weapons(explosives, kinetic and laser), and design.
Sounds like the ideal shape for spaceships will be spherical, like the one in the recent Hitchhiker's Guide move.
"It says he made us all to be just like him. So if we're dumb, then god is dumb, and maybe even a little ugly on the side." -- Frank Zappa