The examination of structure at the microscopic scale, between micrometers and angstrom units, has changed dramatically in recent decades. Many new types of microscopy have emerged, notably the many scanning-probe designs, some of which also allow manipulation of atoms to form wanted structures, while others now permit direct observation of moving proteins in liquids. The traditional electron microscope is being revolutionized by the arrival of aberration correctors and monochromators, which bring the resolution below the Angstrom and electron-volt level. The "laboratory in a microscope"...