Why squeeze rocks? Why indeed! The response of the pure scientist might be similar to that of Mt. Everest climbers: Because they are there to squeeze. But I suppose most of us would come up with more mundane motives, among which may be included bread and butter and a variety of rationalizations. On one hand, motives may arise primarily from a materials science interest, an interest in the properties and behavior of rocks as a particular type of material. On the other hand, they may arise primarily from a geological or geophysical interest, in which case the aim is mainly to gain knowledge of rock behavior that helps in understanding phenomena in the Earth.