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Construction guys have the best toys, and that one is the most mysterious to me. It's a pump. A cement mixer dumps readymix into a hopper at the bottom, and it pumps the concrete up as much as four floors. That's quite a column, and wet concrete is heavy. What kind of pump can move a liquid loaded with hard chunks (gravel) against that much back pressure? I suppose it's a screw, simply because I can't imagine anything else that could work, but it's still astounding.

Just thought I would share something completly different today ... see if we can get the construction guy interested in this web site :)