1. The Young Lady's Illustrated Primer from The Diamond Age
2. Powered Exosuits from Starship Troopers
3. The Bussard Ramjet from Tau Zero
4. The Space Elevator from The Fountains of Paradise
5. Terraforming Methods from Green Mars
The 5 Coolest Technologies from Hard Science Fiction
These are some of the most fascinating pieces of tech ever envisioned in hard science fiction — and they might become reality sooner than you'd think.
