Today, Jupyter Notebooks have become ubiquitous across computational education and research, science, data science, and machine learning. Many millions of users and tens of thousands of organizations use Jupyter on a daily basis. As of early 2021, there are over 10 million public Jupyter Notebooks on GitHub alone. Major research collaborations and communities across physics, chemistry, biology, economics, earth science, etc. leverage Jupyter as a foundational tool for their computational work, collaboration, education, and knowledge dissemination. Entire curricula at universities and massive open online courses (MOOCs) are based on Jupyter. All major cloud providers and multiple startups offer products and services based on Jupyter notebooks.