Annual Reviews is a nonprofit organization that has provided the scientific community worldwide with the latest synthesis of significant primary research literature since 1932. It offers collections of critical reviews written by leading scientists in 32 focused disciplines within the biomedical, physical and social sciences. Published annually, Annual Reviews is among the most highly cited publications in scientific literature and is ranked among the top ten publications within its respective disciplines. It helps to bring new and important primary research in a manner that filters the principal contributions, maintaining a high quality and available in both print and online. Both current and back volumes are available for individuals as well as institutions. It has its headquarters in Palo Alto, Calif.