The Pisa study - Can tigers actually fly? And if so, are bears faster flyers? Even though the little bear is fatter than the little tiger? Schlüter is concerned with questions like these. An experiment should provide the answer. But a major gravity experiment requires a place steeped in history. What better place than Pisa with its leaning tower? However, the tower itself is currently struggling with gravity, as it is threatening to fall over. Can our friends prevent the landmark from collapsing despite the influence of the Mafia's black hand?