For hundreds, maybe thousands of years, people have been trying to figure out how

primitive people could build huge structures such as Stonehenge and the pyramids

out of stone blocks weighing thousands of pounds.

Scientists have been stumped.

Then along comes Wally - a retired construction worker and he says:

" Well, I would do it like this." And he does. 

  http://j-walkblog.com/index.php?/weblog/posts/moving_big_rocks