pp 1601-1603 December 2021 Editorial

Editorial

pp 1606-1606 December 2021 Science Smiles

Science Smiles

pp 1607-1612 December 2021 Article-in-a-Box

Lessons Learned From the Study of Animal Behaviour

pp 1613-1627 December 2021 General Article

Scientific Curiosity and the Natural World: The Legacy of Peter Marler's Research

Anand Krishnan

pp 1628-1628 December 2021 Filler

Filler

pp 1629-1641 December 2021 General Article

Pioneering Works of N. S. Kapany in Biomedical Optics: Live Tissue Imaging, Retinal Photocoagulation, and Optical Oximetry

Biswajit Panda Kamal P Singh

pp 1642-1642 December 2021 Filler

Filler

pp 1643-1648 December 2021 General Article

Extremality of Prime Factorization

K S Mallikarjuna Rao

pp 1649-1661 December 2021 General Article

TRPs and PIEZOs Receive the Spotlight for Winning the Nobel

Koomity V Nageswar Santoshi Nayak Appu K Singh

pp 1662-1662 December 2021 Filler

Filler

pp 1663-1676 December 2021 General Article

Buffon's Needle Problem for the Taxicab Geometry: or Why $\pi = 4$

Alan McRae

pp 1677-1703 December 2021 General Article

Two-Level Systems in Quantum Chemistry and Physics

Sushanta Dattagupta

pp 1704-1704 December 2021 Filler

Filler

pp 1705-1720 December 2021 General Article

Analysis of Atomic Entanglement in Three-mode Jaynes--Cummings Model for Different Field Statistics

Amrita Rohit Singh Aprajita Krishna Kavita Verma

pp 1721-1724 December 2021 Classroom

Corrected Probability Mass Function of the Binomial Distribution

Palash Ghosh

pp 1725-1729 December 2021 Classics

Culturally Transmitted Patterns of Vocal Behavior in Sparrows

Peter Marler Miwako Tamura

pp 1730-1730 December 2021 Filler

Filler

pp 1731-1733 December 2021 Crossword

Intersections 5: A (mostly) Scientific Crossword

Shobhana Narasimhan Madhavan Mukund

pp 1734-1734 December 2021 Filler

Filler

pp 1735-1735 December 2021 Crossword

Intersections 4: A (mostly) Scientific Crossword: Answer

Shobhana Narasimhan Madhavan Mukund

pp 1736-1736 December 2021 Filler

Filler

pp 1737-1740 December 2021 Information and Announcements

Information and Announcements

pp 1741-1741 December 2021 Life Under Water

Bornean Slow Loris