BARCELONA, Spain, Feb. 21 -- The Autonomous University of Barcelona issued the following news: * * * Iberian nailed head ritual was more complex than expected A study led by the UAB at the sites of Puig Castellar and Ullastret suggests that the nailed heads ritual did not correspond to the same symbolic expression among the Iberian communities of the northeast of the Iberian Peninsula, but rather a practice that differed in each settlement. In some, external individuals were used as symbols o  more