Stonehenge bluestones moved with aid of ball bearings?

A new study suggests that the massive "bluestones" at Stonehenge may have been moved into place with the help of ball bearings.

Researchers from the University of Exeter tested the theory by creating cricket ball sized placed in grooves in timber planks. "This proved the balls could move large heavy objects and could be a viable explanation of how giant stones were moved," said Professor Bruce Bradley, director of experimental archaeology at the university.