1. Editorial

   • N. Sathyamurthy

   Departments 04 December 2019 Pages: 1183 - 1184

2. Science Smiles

   • Ayan Guha

   Departments 04 December 2019 Pages: 1185 - 1185

3. M.G.K. Menon - Statesman of Indian Science

   • Naba K. Mondal
   • Sreerup Raychaudhuri

   General Article 04 December 2019 Pages: 1189 - 1233

4. A Pedagogical Relook at Bertrand’s Theorem

   • Jeevitha T. U.
   • Sanjit Das

   General Article 04 December 2019 Pages: 1235 - 1251

5. The Explosive Chemistry of Nitrogen

   • Dheeraj Kumar
   • Anil J. Elias

   General Article 04 December 2019 Pages: 1253 - 1271

6. The Annular Eclipse of 26th December 2019

   • Anand Mathew Kurien
   • H. S. Mani
   • Amitabh Virmani

   General Article 04 December 2019 Pages: 1273 - 1286

7. How to Design Experiments in Animal Behaviour

   • Raghavendra Gadagkar

   Series Article 04 December 2019 Pages: 1287 - 1310

8. Meet Your Match

   • Kapil Hari Paranjape

   Classroom 04 December 2019 Pages: 1311 - 1315

9. Observations on the Decay of Heavy Mesons in Photographic Emulsions

   • Naba K. Mondal
   • M. G. K. Menon
   • C. O’Ceallaigh

   Classics 04 December 2019 Pages: 1317 - 1345

10. Science Academies’ Summer Research Fellowship Programme for Students and Teachers 2020

    • M. R. N. Murthy

    Information and Announcements 04 December 2019 Pages: 1347 - 1347

11. Night Life

    Departments/Inside Back Cover 04 December 2019 Pages: 1348 - 1348