BY JIM HIGHTOWER Little known fact: Practically every skyscraper in every one of the world’s cities is essentially made of sand. As are nearly all shopping malls, condo complexes, office towers, parking garages, airport terminals, dams and other large structures. America builds with concrete – gabillions of tons of it – and concrete is nothing but sand mixed with a bit of gravel and water, then bound together with cement and a few other ingredients, […]