The ABC’s of LIGO, a picture book which introduces an alphabet of terms relating to black holes, gravitational waves, and the LIGO Scientific Collaboration, is now available for free download. Hard copies can be purchased at LIGO Hanford Observatory and the Caltech Bookstore, with proceeds going to LIGO’s international teacher program. Written by Amber Strunk, with gorgeous illustrations and layout by Bella Lopez, Hannah Preisinger, and Aurore Simonnet. Learn more about this book here.