This document advertises the book "Machine Learning with TensorFlow, Second Edition" which teaches machine learning concepts and how to use the TensorFlow library to build machine learning models. It provides a 42% discount code for the book and details that it has been updated with new code, projects and chapters. The author, Chris Mattmann, is a Principal Scientist at NASA Jet Propulsion Lab who has applied TensorFlow to image captioning and other challenges at NASA.