I have been vising my husband down at the work site for years, but never paid attention to the trucks on site.  Yesterday I was able to take a closer look at the concrete trucks that were in use.  I noticed the complex way in which they took something as simple as dry concrete and mixed it round in the drum to the proper consistency that was needed to lay the foundation to the building.  They were an amazing alternative to doing it by hand, and I have a new found respect for workers that use the trucks in every day work.