Researchers at Curtin University in Australia have presented evidence that humans, rather than glaciers, moved the rocks used in Stonehenge’s construction to England. The average sarsen (sandstone block) at Stonehenge weighs 25 tons; the average bluestone ranges from 2 to 5 tons, and the largest weighs 40 tons. Now it seems almost certain that the stones were moved by people. Scientists at Curtin tested sediments collected from streams around Stonehenge for mineral evidence of glacial activity. According to their findings, the area remained unglaciated during the Pleistocene, making direct glacial transport of Stonehenge’s megaliths unlikely.