1. Editorial

   • T. N. C. Vidya

   Departments 26 December 2019 Pages: 1349 - 1351

2. Science Smiles

   • Ayan Guha

   Departments 26 December 2019 Pages: 1354 - 1354

3. Science Versus Ideology

   • Sujata Deshpande

   General Article 26 December 2019 Pages: 1355 - 1373

4. Nobel Prize in Physiology or Medicine 2019

   • Mamatha M. Reddy

   General Article 26 December 2019 Pages: 1375 - 1380

5. Nobel Prize in Chemistry 2019

   • A. Ramanan

   General Article 26 December 2019 Pages: 1381 - 1395

6. Nobel Prize in Physics 2019

   • Dhruba J. Saikia

   General Article 26 December 2019 Pages: 1397 - 1411

7. How to Design Experiments in Animal Behaviour

   • Raghavendra Gadagkar

   Series Article 26 December 2019 Pages: 1413 - 1426

8. Megaprojects: 2 Facility for Antiproton and Ion Research

   • Subhasis Chattopadhyay
   • R. K. Bhandari
   • Paolo Giubellino

   Series Article 26 December 2019 Pages: 1427 - 1438

9. Unscientific Determination of Fermi Energy of Copper by Heating and/or Cooling a Copper Wire

   • Chetan Kotabage
   • A. C. Abhyankar

   Classroom 26 December 2019 Pages: 1439 - 1443

10. Burning Ropes to Measure Time

    • Jyotirmoy Sarkar

    Classroom 26 December 2019 Pages: 1445 - 1469

11. Illuminating the Code Reader

    • Mahak Sharma

    Departments/Book Review 26 December 2019 Pages: 1471 - 1474

12. The Law of Homologous Series in Variation by Nikolai Vavilov

    • Sujata Deshpande

    Classics 26 December 2019 Pages: 1475 - 1521

13. Erratum to: Retrosynthetic Analysis

    • Bharati V. Badami

    Erratum 26 December 2019 Pages: 1523 - 1523

14. Resonance@25 — Science Workshop

    Information and Announcements 26 December 2019 Pages: 1525 - 1525

15. Birds in the Backyard

    • T. N. C. Vidya

    Departments/Inside Back Cover 26 December 2019 Pages: 1527 - 1527