Talk:Umbra/@comment-24040907-20141126003200/@comment-24040907-20141216222350

I mean, I'm sure they had all sorts of creative and intuitive tools at their disposal. Did aliens build the structures? Probably not. Did the humans build the structures for aliens, or gods that they may have believed in? Possibly. There was this theory going around a while back about the Great Pyramids being specifically designed to vent Hydrogen gas into a certain point in the air above the structure itself. So, if you had a spaceship that runs on Hydrogen, just park it above the pyramid and tell the people below to fill 'er up xD