Latest ActivityNewest DiscussionsMost Popular
Imagine a solar updraft tower where the wall of the tower is a stack of toroidal balloons filled with a buoyant gas such as He or NH3. The…
Started by James Bowery
Sign Upor Sign In
© 2013 Created by PickensPlan.
Community Guidelines | Report an Issue |
Terms of Service
Please check your browser settings or contact your system administrator.