Is it possible that gravity is a resultant force of electromagnetism. Electromagnetism like the weak force may be asymetric. That is electromagnetic attraction is stronger the electromagnetic repulsion. When they cancel out universally a very week attraction only force is left over.
This would explain why gravity is so weak. Also it would explain why gravity waves and gravitons have not been discovered they don't exist. The waves in relativity are electromagnetic waves. It would also give us a simple way of unifying the four forces