Researchers found that the Altar Stone at Stonehenge might have come from northeast Scotland, over 700 kilometers (434 miles) away from its location in southwest England. Scientists were puzzled by how people managed to move this 6-ton rock across Britain. However, a study published in thejournal Nature provided some answers to this mystery. Anthony Clarke, lead author, and PhD student at Curtin University’s School of Earth and Planetary Sciences, told IFLScience, “The Altar Stone is a sandstone made up of individual grains, kind of like grains at the beach that have been squished together, an…