Pestle (IMAGE) University of Maryland Caption This prehistoric pestle was cemented among the bricks at the back of the furnace. Leone identifies it as an African charm put there by the slave who built the furnace. Credit UMD Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.