A recent article published on Science Daily, [New Kind of Metal in the Deep Earth: Iron Oxide Undergoes Transition Under Intense Pressures and Temperatures](http://www.sciencedaily.com/releases/2011/12/111219112216.htm
), discusses the same processes Leedskalnin identifies as the mechanisms responsible for gravity.I think the Radium and Uranium were built up inside the earth with high pressure, and heat, while the North and South pole individual magnets were circulating through the earth. During the time the Radium and Uranium were inside the earth they absorbed more of the individual North and South pole magnets than they normally could hold, and so now while they are on top of the earth they let the magnets go so they can become normal again.
Gravitation must be caused by the matter in the middle of the earth, and more concentrated than Uranium. When Uranium atoms burst they release the North and South pole individual magnets that held the atom together, then the magnets scatter all around, they can only pass from the middle to the outside. When the North and South pole magnets are running alongside each other and in the same direction, they have no attraction for the other kind. They only attract if they are running one kind against the other kind. When the magnets are running out of the middle of the earth, as soon as they meet an object they attract it, on account of the fact that in any object there is both kinds of magnets in it.