"Unless you are prepared to accept the proven scientific fact that hard work makes you tired, and that very hard work makes you tired very quickly I see no point in wasting my time replying further."
Gordon. that's an inarguable scientific fact, of course, but it also has a further implication - easy work makes you tired very slowly.
At Foamhenge it was obvious that hard work makes you tired very quickly, but that cannot be taken as proof that dragging was an ineffective method, merely that the number of pullers was at the lower limit of viability for the method. Had their been two or three times as many then the work would have been easy and they could have done it all day, surely? If you say, no, there are reasons why it would still have been hard then I would keep adding to the numbers until it wasn't...