Underwater sound has the potential to impact marine mammals and other marine species. It can be challenging to keep up with the latest research developments, as well as understand the multidisciplinary complexities of underwater sound. To provide an accurate, scientific resource on the science of underwater sound, the Discovery of Sound in the Sea (DOSITS) <http://www.dosits.org/> team has produced a new, interactive electronic book (eBook), Discovery of Sound in the Sea (DOSITS) Book II: Science of Underwater Sound <https://dosits.org/book/>, which contains high-resolution imagery, videos, and sound files. It provides a condensed electronic resource that focuses on the fundamental science of underwater sound, sound movement/propagation and sound measurement/signal levels, as well as advanced content, including ocean noise measurement, variability, and noise budgets. Several topics in the book are areas of active scientific research; new information will be integrated into the eBook as peer-reviewed publications become available. The content in this book is based on the DOSITS project, including its website, www.dosits.org. DOSITS content is based on well-understood scientific principles, peer-reviewed literature, and high-quality scientific data. Independent, scientific experts, who specialize in underwater acoustics, have reviewed all DOSITS content. The DOSITS project keeps its content as up-to-date as possible, incorporating new research findings twice a year. The book is available in the ITunes store <https://itunes.apple.com/us/book/discovery-sound-in-sea-book-ii-science-underwater-sound/id1354532634?ls=1&mt=11> for macOS, iPad, and iPhone. To view sample pages and access the book via an iTunes link, please visit the DOSITS website at www.dosits.org/book/. Information and an iTunes link for Book I: Importance of Sound in the Sea can also be found on this page. Questions? Please contact Holly Morin (holly_morin@uri.edu). *********************************** Holly Morin Marine Research Associate III URI/GSO/ISC (401) 874-6414 holly_morin@uri.edu