  Recently, it was discovered that microsphere can generate super-resolution
focusing beyond diffraction limit. This has led to the development of an
exciting super-resolution imaging technique -microsphere nanoscopy- that
features a record resolution of 50 nm under white lights. Different samples
have been directly imaged in high resolution and real time without labelling,
including both non-biological (nano devices, structures and materials) and
biological (subcellular details, viruses) samples. This chapter reviews the
technique, which covers its background, fundamentals, experiments, mechanisms
as well as the future outlook.
