1. Physics and (Natural) Philosophy

   • Robert P. Crease
   • Joseph D. Martin
   • Richard Staley

   Editorial 04 December 2019 Pages: 255 - 256

2. Varying Constants of Nature: Fragments of a History

   • Helge Kragh

   OriginalPaper 29 November 2019 Pages: 257 - 273

3. Einstein’s Gyros

   • József Illy

   OriginalPaper 05 December 2019 Pages: 274 - 295