(M)any materials experience "fatigue", where, because of cyclic loading, they'll begin to deform or even fail well below their theoretical yield strength
In science, a law isn't "better than" a theory. Laws are descriptive (e.g., energy is neither created nor destroyed) while theories are explanatory. Both are well supported by evidence (M)
Small particles in a gas or liquid constantly (m)ove around randomly. Work on this "Brownian motion" led to the acceptance of atoms as physical reality
