Allan Franklin is an emeritus professor of physics at the University of Colorado. His current research area is the history and philosophy of science, particularly on the roles of experiment. In 2016, Franklin received the Abraham Pais Prize for History of Physics from the American Physical Society. He is the author of 11 books including, most recently, Shifting Standards: Experiments in Particle Physics in the Twentieth Century and What Makes a Good Experiment?: Reasons and Roles in Science.

Contents
1 Introduction
I Successful Replications 2 The Discovery of the Higgs Boson 3 The Discovery of Gravity Waves 3.1 The Binary Pulsar 3.2 The Binary Black Hole Merger 4 The Scattering of Antineutrons by Protons
II Failed Replications 5 Is There a Fifth Force? 5.1 Thieberger’s Experiment 5.2 The Eӧt-Wash Experiment 5.3 Discussion 5.4 A Bayesian Interlude 6 Is There a Universal Gravitational Constant? 6.1 Measurements of G 6.2 A Curious Correlation?
III. Problems, Large and Small 7 Physical Constants and the Properties of Elementary Particles 8 Millikan’s Measurements of the Charge of the Electron 8.1 The 1911 Experiment 8.2 The 1913 Experiment 9 Are There Low-Mass Electron-Positron States? 9.1 Positron Lines 9.2 Electron-Positron States 10 The Pentaquark 10.1 The Experimental Results 10.2 Discussion 11 Whose Neutrino Is It, Majorana’s or Dirac’s? 11.1 The Problem 11.2 The Early Experiments 11.3 The Second Generation Experiments 11.4 Discussion 12 Conclusion