William Henry Bragg moved from Cambridge in Britain to South Australia to take up a professorship at the University of Adelaide in 1885. He brought with him a broad interest in many areas of physics, but when Wilhelm Roentgen discovered X-rays in the 1890s, Bragg's interest was stimulated. William's Australian-born son, Lawrence (WL Bragg), began to share this interest and they worked on the possible applications of X-rays. Together they demonstrated that when X-rays are shined onto a crystal, and the pattern of how the x-rays are scattered (called "diffraction") is examined, information about how the atoms within the crystal are arranged can be gleaned. This Nobel prize-winning "X-ray crystallography" has become the basis for many modern high-technology solutions to challenging problems. This article describes a few examples of the kind of equipment that can be used for crystallography, and the kind of information that can be obtained using them.