The aim of the Expositions is to present new and important developments in pure and applied mathematics. Well established in the community over more than two decades, the series offers a large library of mathematical works, including several important classics. The volumes supply thorough and detailed expositions of the methods and ideas essential to the topics in question. In addition, they convey their relationships to other parts of mathematics. The series is addressed to advanced readers interested in a thorough study of the subject. Editorial Board Lev Birbrair, Universidade Federal do Ceara, Fortaleza, Brasil Walter D. Neumann, Columbia University, New York, USA Markus J. Pflaum, University of Colorado, Boulder, USA Dierk Schleicher, Jacobs University, Bremen, Germany Katrin Wendland, University of Freiburg, Germany Honorary Editor Victor P. Maslov, Russian Academy of Sciences, Moscow, Russia Titles in planning include Yuri A. Bahturin, Identical Relations in Lie Algebras (2019) Yakov G. Berkovich, Lev G. Kazarin, and Emmanuel M. Zhmud', Characters of Finite Groups, Volume 2 (2019) Jorge Herbert Soares de Lira, Variational Problems for Hypersurfaces in Riemannian Manifolds (2019) Volker Mayer, Mariusz Urbanski, and Anna Zdunik, Random and Conformal Dynamical Systems (2021) Ioannis Diamantis, Bostjan Gabrovsek, Sofia Lambropoulou, and Maciej Mroczkowski, Knot Theory of Lens Spaces (2021)

From Emmy Award-winning journalist Anna Crowley Redding comes a captivating nonfiction picture book that explores the fabled apple tree that inspired Isaac Newton's theory of gravity. From a minor seed to a monumental icon, it inspired the world's greatest minds, including Albert Einstein and Stephen Hawking. "A sweet windfall of history and inspiration." -Kirkus (starred review) "This picture book may resonate with science-minded children." -Booklist A tree may seem like a rather ordinary thing. But hundreds of years ago, a tree was about to embark on an extraordinary journey. And it all started with just a speck of a seed. . . . It began in the 1600s with a seed that became the tree that grew the apple that fell right before Isaac Newton's eyes. This seemingly simple event sparked one of the greatest scientific discoveries-Newton's theory of gravity! A chain reaction of ideas and discoveries followed from the likes of Albert Einstein and Stephen Hawking, who traveled to the place where these scientific journeys began-Isaac's tree. From rocketing into space to adorning the queen's carriage, the Gravity Tree's unexpectedly remarkable and true life story is a tale for the ages. Award-winning journalist Anna Crowley Redding unearths the story of how something so small could change the world. The Gravity Tree is a beautiful nonfiction picture book to share at home or in the classroom. A Bank Street Best Children's Book of the Year A Kirkus Children's Best Book of the Year