1. Editorial

   • Jasjeet Singh Bagla

   EditorialNotes 31 July 2021 Pages: 863 - 865

2. Science Smiles

   • Ayan Guha

   Announcement 31 July 2021 Pages: 868 - 868

3. Govind Swarup

   • Dhruba J. Saikia

   General Article 31 July 2021 Pages: 869 - 893

4. Beginnings and Growth of Radio Astronomy in TIFR

   • S. Ananthakrishnan
   • V. Balasubramanian

   General Article 31 July 2021 Pages: 895 - 917

5. Atomic Hydrogen in Distant Galaxies

   • Nissim Kanekar
   • Aditya Chowdhury
   • Jayaram N. Chengalur

   General Article 31 July 2021 Pages: 919 - 938

6. Quantum Game Theory — III

   • Indranil Ghosh

   General Article 31 July 2021 Pages: 939 - 951

7. Machine Learning in Nonlinear Dynamical Systems

   • Sayan Roy
   • Debanjan Rana

   General Article 31 July 2021 Pages: 953 - 970

8. Genome Editing Revolution in Life Sciences

   • Alok Kumar Singh
   • Sivaprakash Ramalingam
   • Srinivasan Chandrasegaran

   General Article 31 July 2021 Pages: 971 - 998

9. Four Color Problem

   • Jasbir Chahal
   • Rebekah Bassett
   • Vanessa Rico

   Classroom 31 July 2021 Pages: 999 - 1006

10. Visual Estimation of Sum of First n Triangular, Tetrahedral and Pentatope Numbers

    • Rajib Mukherjee
    • Manishita Chakraborty

    Classroom 31 July 2021 Pages: 1007 - 1013

11. Upper Limit of the Periodic Table and the Future Superheavy Elements

    • Rajarshi Ghosh

    Classroom 31 July 2021 Pages: 1015 - 1021

12. Evidence of Limb-brightening of the Sun at 60 cm Wavelength

    • Divya Oberoi

    Classics 31 July 2021 Pages: 1023 - 1026

13. Resonance Conference: Celebrating 25 Years of Resonance

    Information and Announcements 31 July 2021 Pages: 1027 - 1027

14. Erratum to: Of Light and Shadows

    • Joseph Samuel

    Erratum 31 July 2021 Pages: 1028 - 1028

15. Birds in the Backyard

    • T. N. C. Vidya

    Announcement 31 July 2021 Pages: 1029 - 1029