Watching a towboat push its massive load of barges up or down river is a source of endless fascination to all. Watching it angle around a sharp bend or fit perfectly into a lock makes us marvel at the captain’s skill. Learning even a little about the tonnage that they carry, as we talked about in the post called “All Things to All Creatures” on September 23 (click here if you missed that) makes us marvel that’s it’s even possible.  But, they are not accessible to us and we know very little about what it’s like out there.