The invention of optical-frequency combs has transformed the fields of precision metrology, spectroscopy, and electronic/photonic signal generation. Now, a new and incredibly promising platform for frequency combs has emerged—one in which phase coherent combs are generated in nanofabricated ring resonators using quantum nonlinear photonics. In this talk, the principles behind microresonator combs will be presented, as well as their recent applications in integrated-photonics optical synthesizers and optical clocks, and a new experiment using laser cooling to control the particle-like properties of the comb light itself.