Developing applications for the Android mobile operating system can seem daunting, particularly if it requires learning a new programming language: Kotlin, now Android's official development language. With this practical book, Android developers will learn how to make the transition from Java to Kotlin, including how Kotlin provides a true advantage for gaining control over asynchronous computations.

MIST, the Mathematical Image Synthesis Toolkit, is an open-source, Web-based graphics application in which students develop skills in computational thinking and deepen their understanding of mathematical functions through creative play in making images. Students develop a variety of skills in computational thinking by using the small set of images and operations to develop complex images, not only images that the system challenges them to make but also images that they find themselves inspired to create and even images that their peers challenge them to build. MIST also incorporates a community of artists/learners. Images created in MIST are available to other MIST users to comment on and remix (provided the designer permits reuse). MIST community members may also create challenges for other community members and can curate "galleries" of images they find particularly engaging, interesting, or even useful as challenges for others. We find that this additional community further encourages students to develop new and interesting images.