1. Editorial

   • V. Rajaraman
   • Amitabh Joshi

   Deparments Pages: 1 - 5

2. The study of butterflies

   • Peter Smetacek

   Series Article Pages: 8 - 14

3. Photodynamic Therapy (PDT)

   • Bhaskar G. Maiya

   Series Article Pages: 15 - 29

4. The antiquity of earthquakes

   • Ramesh Chander
   • Priyamvada Singh

   General Article Pages: 30 - 39

5. Triangularization of a matrix

   • Rajendra Bhatia
   • Radha Mohan

   General Article Pages: 40 - 48

6. Some aspects of convexity

   • V. S. Sunder

   General Article Pages: 49 - 59

7. The importance of systematics

   • T. C. Narendran

   General Article Pages: 60 - 68

8. Beauty of entropy

   • Shabnam Siddiqui

   Departments Pages: 69 - 75

9. Torsion pendulum experiment at the International Physics Olympiad

   • Sandeep Bala

   Departments Pages: 76 - 85

10. Mythology in introductory biology

    • Steven Vogel

    Departments Pages: 86 - 95

11. Think it over

    • B. Sury

    Departments Pages: 96 - 96

12. Amartya Sen and the mathematics of collective choice

    • Bhaskar Dutta

    Research News Pages: 97 - 103

13. Refresher course in theoretical physics

    Information and Announcements Pages: 104 - 104