Loop quantum gravity. Loop quantum gravity (LQG) is a theory that attempts to describe the quantum properties of the universe and gravity. It is also a theory of quantum spacetime because, according to general relativity, gravity is a manifestation of the geometry of spacetime. LQG is an attempt to merge quantum mechanics and general relativity.
Eco Block, ARXX, Logixx are a few along with TriTex. Cost per block is around $12 and they are 5.33 sqft and various thickness depending on your needs. So a 35x43 house would need 234 blocks and about a ton (lift) of rebar, and require roughly 33 cubic yards of concrete using an 8  core thickness.
Ultrablock Modular Blocks Providing Green Solutions.... For over 25 years Ultrablock has been recognized for providing a sustainable solution to customers retaining wall needs. Standard concrete blocks are produced utilizing surplus or recycled concrete to provide environmental and economic benefits. Specific concrete mix designs can also be used in manufacturing precast blocks. Ultrablock is used for a continuously growing variety of applications that goes beyond standard retaining walls. Whether your project requires a material bin, a 25-foot tall gravity wall, a 50-foot tall reinforced wall, an impact barrier or blast shield, look to Ultrablock for the right solution.