Explore the announcement of Starbeam, a revolutionary library for building reactive data systems, in this JSNation 2022 conference talk by Yehuda Katz. Dive into the motivation behind Starbeam and learn how its reactivity works seamlessly with popular UI frameworks like React, Vue, Svelte, and Ember. Discover how to leverage Starbeam to create reactive libraries that function natively across various UI frameworks. For the adventurous, gain insights into implementing Starbeam in existing applications and understand the advantages of using it as a state management system. Uncover the potential of universal reactivity and its impact on modern web development in this informative 27-minute presentation.