| perpetual motion(noun, expression, entity, concept, proposition) |
| space elevator(noun, expression, entity, concept, proposition) |
| Bussard ramjet(noun, expression, entity, concept, proposition) |
| Dyson-Harrop satellite(noun, expression, entity, concept, proposition) |
| Dyson sphere(noun, expression, entity, concept, proposition) |
| Stanford torus(noun, expression, entity, concept, proposition) |
| White-Juday warp-field interferometer(noun, expression, entity, concept, proposition) |
| Woodward effect(noun, expression, entity, concept, proposition) |
| alcubierre drive(noun, expression, entity, concept, proposition) |
| artificial general intelligence(noun, expression, entity, concept, proposition) |
| artificial uterus(noun, expression, entity, concept, proposition) |
| brain in a vat(noun, expression, entity, concept, proposition) |
| cloaking device(noun, expression, entity, concept, proposition) |
| dean drive(noun, expression, entity, concept, proposition) |
| digital immortality(noun, expression, entity, concept, proposition) |
| exoskeletal engine(noun, expression, entity, concept, proposition) |
| field propulsion(noun, expression, entity, concept, proposition) |
| fusion rocket(noun, expression, entity, concept, proposition) |
| gravitational shielding(noun, expression, entity, concept, proposition) |
| gravity-vacuum transit(noun, expression, entity, concept, proposition) |