1. Editorial

   • B Sury

   Department 20 February 2021 Pages: 161 - 163

2. Science Smiles

   • Ayan Guha

   Department 20 February 2021 Pages: 166 - 166

3. S S Shrikhande: The Euler Spoiler

   • Sharad S. Sane

   General Article 20 February 2021 Pages: 167 - 176

4. Shrikhande and Designs

   • Bhaskar Bagchi

   General Article 20 February 2021 Pages: 177 - 189

5. Measuring Causality

   • Aditi Kathpalia
   • Nithin Nagaraj

   General Article 20 February 2021 Pages: 191 - 210

6. The Many Avatars of Curzon-Ahlborn Efficiency

   • Ramandeep S. Johal
   • Arun M. Jayannavar

   General Article 20 February 2021 Pages: 211 - 225

7. CRISPR/Cas for Crop Improvement

   • Arvinder Singh
   • Muskan Bokolia

   General Article 20 February 2021 Pages: 227 - 240

8. Discovery of Room Temperature Ionic Liquid

   • Rajarshi Ghosh

   General Article 20 February 2021 Pages: 241 - 244

9. Continent Deformation Due to Earthquake Cycle and Landscape Evolution

   • Vineet K. Gahalaut

   General Article 20 February 2021 Pages: 245 - 256

10. The Idea of a Lax Pair-Part II

    • Govind S. Krishnaswami
    • T. R. Vishnu

    General Article 20 February 2021 Pages: 257 - 274

11. What Did You Ask at School Today?

    • Lilavati Krishnan

    Book Review 20 February 2021 Pages: 275 - 280

12. Let Us Read a Wonderful Story...

    • Sujata Deshpande

    Book Review 20 February 2021 Pages: 281 - 282

13. The Impossibility of Certain Symmetrical Balanced Incomplete Block Designs

    • B. Sury
    • S. S. Shrikhande

    Classics 20 February 2021 Pages: 283 - 289

14. Masterclass Series

    Information and Announcements 20 February 2021 Pages: 291 - 291

15. Birds in the Backyard

    Department 20 February 2021 Pages: 293 - 293