
Running up the center of the building is a fortresslike tower whose walls, made of two-to-three-foot-thick reinforced concrete and steel, will provide structural support for the building and fire protection for the infrastructure it contains: elevators, stairways and utilities such as the pipes that carry water to the sprinklers.

| regarding | user | just commented |
|---|---|---|
| Farming in the Sky | njdevil | Popmech and Popsci have have |
| Virgin Galactic Rolls Out Mother Ship | BNicholson | Seems a pity to just have a |
| Habitats for Humanity | BNicholson | Actually, Nasa is chock full |
| A More Efficient Hybrid | charles_lang | Not all the 70 percent loss |
| A More Efficient Hybrid | All4Vols | The device would have to |

