Intro; Einstein Studies Series Preface; Preface; Contents; Part I Mathematical and Physical Underpinnings of Spacetime; 1 Figures of Light in the Early History of Relativity (1905-1914); 1.1 Introduction; 1.2 Einstein's Light Sphere; 1.3 Poincaré and the Lorentz Group; 1.4 Langevin's Electron Wake; 1.5 Poincaré's Light Ellipse; 1.6 Minkowski's Lightcone; 1.7 Alfred A. Robb: Repurposing the Lightcone; 1.8 Applications of the Light Sphere; 1.9 Light-Figure Skepticism; 1.10 Discussion; References; 2 The Behaviour of Rods and Clocks in General Relativity and the Meaning of the Metric Field

2.1 Introduction2.2 Clocks and Their Complications; 2.3 Special Relativity; 2.3.1 Einstein's Second Thoughts; 2.3.2 The Sense in Which Rods and Clocks Don't ``Measure''; 2.4 General Relativity; References; 3 Hilbert on General Covariance and Causality; 3.1 Introduction; 3.2 Einstein's ``Causality Problem''; 3.3 Einstein's ``Point Coincidence Argument''; 3.4 Hilbert's ``Causality Problem'', 1915; 3.5 Hilbert's ``Causality Problem'', 1917; 3.6 Hilbert's 1917 Resolution of His ``Causality Problem''; 3.7 Hilbert and Einstein Compared; 3.8 Conclusion; References

Part II Testing General Relativity and Rival Theories4 Putting General Relativity to the Test: Twentieth-Century Highlights and Twenty-First-Century Prospects; 4.1 Introduction; 4.2 Twentieth-Century Highlights; 4.2.1 The Einstein Equivalence Principle; 4.2.2 Solar System Tests; 4.2.3 Binary Pulsars; 4.3 Twenty-First-Century Prospects; 4.3.1 Gravitational-Wave Tests of Gravitation Theory; 4.3.2 Tests of Gravity in the Strong-Field Regime; 4.4 Conclusions; References; 5 Rotating Hollow and Full Spheres: Einstein, Thirring, Lense, and Beyond; 5.1 Introduction

5.2 Einstein's 1913 Work on Rotating Spheres5.3 The Contributions of Thirring and Lense from the Years 1917 to 1918 and Their Dependence on Einstein's Intervention; 5.4 Deficiencies of the 1918 Papers by Thirring and Lense and Their Corrections; 5.5 The Solution of the Centrifugal Force Problem; 5.6 A Quasiglobal Principle of Equivalence; 5.7 Cosmological Considerations; References; 6 Relativistic Lighthouses: The Role of the Binary Pulsar in Proving the Existence of Gravitational Waves; 6.1 Introduction; 6.2 Controversy; 6.3 Discovery; 6.4 Trading Zones and Pidgins; 6.5 Skeptics' Dilemma

6.6 Theory Testing6.7 Conclusions; References; 7 The Rise and Fall of the Fifth Force; 7.1 The Rise …; 7.1.1 K-Meson Decay and CP Violation; 7.1.2 Modifications of Newtonian Gravity; 7.1.3 The Fifth Force; 7.2 …and Fall; 7.2.1 The Immediate Reaction; 7.2.2 A Composition-Dependent Force? Was Galileo Wrong?; 7.2.3 Towers and Mineshafts: The Distance Dependence of the Gravitational Force; 7.3 Epilogue: The Fifth Force Since 1991; 7.3.1 The 1990s; 7.3.2 The Twenty-First Century; 7.3.3 Discussion; References; Part III Geometry and Cosmology, Past and Present