Our planet shakes with over one thousand earthquakes every day. The strongest ones destroy buildings, roads, and lives. They trigger killer tidal waves called tsunamis. Yet most earthquakes are too weak to feel. What causes earthquakes? And what makes the difference between a killer quake and a harmless one? Learn more about earthquakes with these thirteen fun experiments you can do yourself. You'll think like a seismologist as you build models of faults, study earthquake-proof structures, and even try to predict the next "big one."