New Delhi, April 16 -- A video emerged on social media this week, showing the principal of Delhi University's Lakshmibai College coating the walls of a classroom with cow dung. The video sparked a row. In protest, Delhi University Students Union (DUSU) president Ronak Khatri smeared cow dung on the walls of her office on Tuesday.

College Principal Pratyush Vatsala claimed that the cow dung experiment was aimed to explore indigenous methods to cool classrooms. She cited previous research on cow dung's cooling effects.

She told news agency PTI, "We started a study to control heat stress...Research has been done on cow dung earlier as well."

"So, in that background, since there was no plaster in the portacabin and it was located on the se...