'Apples to oranges' and 'Less is more'. Issue 6 (June 2021) - Argyris, Antonios A.; Samara, Stamatia; Blacher, Jacques; Papaioannou, Theodoros G.; Stergiou, George S.; Vlachopoulos, Charalambos; Wassertheurer, Siegfried; Weber, Thomas; Protogerou, Athanase D.