The birth of a completely new branch of observational astronomy is a rare and exciting occurrence. For a long time, our theories about gravitational waves—proposed by Albert Einstein and others more than a hundred years ago—could never be fully proven, since we lacked the proper technology to do it. That all changed when, on September 14, 2015, instruments at the LIGO Observatory detected gravitational waves for the first time. This book explores the nature of gravitational waves—what they are, where they come from, why they are so significant and why nobody could prove they existed before now. Written in plain language and interspersed with additional explanatory tutorials, it will appeal to lay readers, science enthusiasts, physical science students, amateur astronomers and to professional scientists and astronomers.

Annotation The essays contained in this book are preliminary studies directed toward a new synthesis of the history of the religion of Israel. Each study is addressed to a special and, in the authors view, unsolved problem in the description of Israel's religious development.

Foreign students have travelled to Britain for centuries and, from the beginning, attracted controversy. This book explores changing British policy and practice, and changing student experience, set within the context of British social and political history.