The essential beginner's guide to string theory The Little Book of String Theory offers a short, accessible, and entertaining introduction to one of the most talked-about areas of physics today. String theory has been called the "theory of everything." It seeks to describe all the fundamental forces of nature. It encompasses gravity and quantum mechanics in one unifying theory. But it is unproven and fraught with controversy. After reading this book, you'll be able to draw your own conclusions about string theory. Steve Gubser begins by explaining Einstein's famous equation E = mc2, quantum mechanics, and black holes. He then gives readers a crash course in string theory and the core ideas behind it. In plain English and with a minimum of mathematics, Gubser covers strings, branes, string dualities, extra dimensions, curved spacetime, quantum fluctuations, symmetry, and supersymmetry. He describes efforts to link string theory to experimental physics and uses analogies that nonscientists can understand. How does Chopin's Fantasie-Impromptu relate to quantum mechanics? What would it be like to fall into a black hole? Why is dancing a waltz similar to contemplating a string duality? Find out in the pages of this book. The Little Book of String Theory is the essential, most up-to-date beginner's guide to this elegant, multidimensional field of physics.

PORTRAITS FROM AROUND THE WORLD CONNECTED BY ONE STRING

Imani is adopted, and she's ready to search for her birth parents. Anna has left behind her family to escape from Holocaust-era Europe to meet a new family--two journeys, one shared family history, and the bonds that make us who we are. Perfect for fans of The Night Diary. Imani knows exactly what she wants as her big bat mitzvah gift: to find her birth parents. She loves her family and her Jewish community in Baltimore, but she has always wondered where she came from, especially since she's black and almost everyone she knows is white. Then her mom's grandmother--Imani's great-grandma Anna--passes away, and Imani discovers an old journal among her books. It's Anna's diary from 1941, the year she was twelve and fled Nazi-occupied Luxembourg alone, sent by her parents to seek refuge in Brooklyn, New York. Anna's diary records her journey to America and her new life with an adoptive family of her own. And as Imani reads the diary, she begins to see her family, and her place in it, in a whole new way.

With half a million copies sold, this accessible, bestselling picture book phenomenon about the unbreakable connections between loved ones has healed a generation of readers--children and adults alike--and has been updated with new illustrations and an afterword from the author. Now available in paperback for the first time! Parents, educators, therapists, and social workers alike have declared The Invisible String the perfect tool for coping with all kinds of separation anxiety, loss, and grief. In this relatable and reassuring contemporary classic, a mother tells her two children that they're all connected by an invisible string. "That's impossible!" the children insist, but still they want to know more: "What kind of string?" The answer is the simple truth that binds us all: An Invisible String made of love. Even though you can't see it with your eyes, you can feel it deep in your heart, and know that you are always connected to the ones you love. Does everybody have an Invisible String? How far does it reach? Does it ever go away? This heartwarming picture book for all ages explores questions about the intangible yet unbreakable connections between us, and opens up deeper conversations about love. Recommended and adopted by parenting blogs, bereavement support groups, hospice centers, foster care and social service agencies, military library services, church groups, and educators, The Invisible String offers a very simple approach to overcoming loneliness, separation, or loss with an imaginative twist that children easily understand and embrace, and delivers a particularly compelling message in today's uncertain times. This special paperback edition includes includes vibrant new illustrations and an introduction from the author. "This book is a beautiful way to begin to try, as parents, to instill in children the impenetrable power of the heart, the energy of love, and the flow that can be felt from the grace in every moment." --Tony Robbins

The purpose of this book is to thoroughly prepare the reader for research in string theory at an intermediate level. As such it is not a compendium of results but intended as textbook in the sense that most of the material is organized in a pedagogical and self-contained fashion. Beyond the basics, a number of more advanced topics are introduced, such as conformal field theory, superstrings and string dualities - the text does not cover applications to black hole physics and cosmology, nor strings theory at finite temperatures. End-of-chapter references have been added to guide the reader wishing to pursue further studies or to start research in well-defined topics covered by this book.

A sociopath is running a deadly social experiment on a university campus. Markus Haas is the first to refuse to play the game. What unravels is a sequence of impossible decisions and a race against time to stop the sociopath before others pay the ultimate price.