Kolkata: The day was observed in Jadavpur University, Calcutta University (Rajabazar Science College), Jogamaya Devi college and Charuchandra college. Observations were also held in Hindu School, Aryakanya  Mohavidyalaya and Victoria high  school under the initiative of  “Young scientist forum” affiliated to BSS and in two main spots of Kolkata – College street and Hazra More.