1. Editorial

   • N. Sathyamurthy

   Departments 30 December 2020 Pages: 1647 - 1649

2. Science Smiles

   • Ayan Guha

   Departments 30 December 2020 Pages: 1652 - 1652

3. Nicolaas Bloembergen (1920–2017)

   • Debabrata Goswami

   Article-in-a-Box 30 December 2020 Pages: 1653 - 1657

4. Compact Objects and Black Holes

   • J. S. Bagla

   General Article 30 December 2020 Pages: 1659 - 1668

5. CRISPR/Cas9 System

   • Rajesh Ramachandran

   General Article 30 December 2020 Pages: 1669 - 1680

6. Discovery of Hepatitis C Virus

   • Aunji Pradhan
   • Sachin Kumar Tripathi
   • Saumitra Das

   General Article 30 December 2020 Pages: 1681 - 1687

7. Magic Vertex-Labeling of a Half-Cube

   • Jyotirmoy Sarkar

   General Article 30 December 2020 Pages: 1689 - 1703

8. The Idea of a Lax Pair—Part I

   • Govind S. Krishnaswami
   • T. R. Vishnu

   General Article 30 December 2020 Pages: 1705 - 1720

9. Chua’s Circuit

   • V. Satya Prakash

   General Article 30 December 2020 Pages: 1721 - 1730

10. The Physical Meaning of Entropy—1

    • Nirupam Rohatgi

    General Article 30 December 2020 Pages: 1731 - 1740

11. Neuropeptides: The Slower Neurotransmitters

    • Umer Saleem Bhat
    • Kavita Babu

    General Article 30 December 2020 Pages: 1741 - 1752

12. Polio Endgame: How India Beat the Monster

    • Anuja Madhekar

    General Article 30 December 2020 Pages: 1753 - 1761

13. Nature of Science

    • Shweta Tanwar

    General Article 30 December 2020 Pages: 1763 - 1776

14. Information and Announcements

    Announcement 30 December 2020 Pages: 1777 - 1777