Architecture Puzzler #72

Most commercially produced adobe bricks are "stabilized" by adding asphalt emulsion (3 to 5 percent by weight) or Portland cement (5 to 10 percent). These coat the clay particles and reduce their tendency to absorb water and expand. Occasionally (and traditionally) straw is added — why?

Who developed a plan to mass-produce monolithic cast-in-place concrete houses to "shelter the working class" in the United States? Henry Ford, Thomas Edison, or Frank Lloyd Wright?