STIRLING, SCOTLAND—An area of abrasive sandstone in central Scotland may have been used as a giant whetstone by Neolithic toolmakers, according to a BBC News report. Volunteers and Stirling Council archaeologist Murray Cook removed a layer of turf from the sandstone and recorded 33 U-shaped grooves, or polissoirs, where stone axes are thought to have been polished some 4,500 years ago. Cook suggests that people may have come from miles around to sharpen and smooth their tools at the site. To read about recent investigations at Scotland's Caerlaverock Castle, go to "Storming the Castle."