With a demonstrated resolution of fractions of a nanometer, the atomic force microscope (AFM) is one of the foremost tools for imaging, measuring, and manipulating matter at the nanoscale. Unlike the electron microscope, which provides a two-dimensional image of a sample, the AFM provides a true 3-D surface profile. Though the term “microscope” suggests the visual study of minute samples, this high-tech device functions in an entirely different manner. How does the AFM gather information? Discuss