Prime Minister Narendra Modi, in the 137th episode of Mann Ki Baat, highlighted a website that allows users to find out which rulers governed different parts of Bharat in a particular year.Modi said users can visit the website and select any year to easily find out who ruled which part of Bharat at that time. He said he found the initiative interesting and noted that it was created by Mumbai's Krishna Sheshadri.Modi also pointed out the website's simple name — http://www.bharatrajya.com.He said Sheshadri's effort would not only benefit students of history but also help people learn the subject in an interesting manner.Modi also highlighted the 'Nasha Mukt Yuva for Viksit Bharat' campaign, saying it is gaining momentum across the country."Its goal is clear: drug-free youth, drug-free India," Modi said, adding that many people, particularly the youth, have become a large part of the campaign.He described the campaign as a collective resolve towards the health, happiness and bright future of Bharat's youth.During the broadcast, Modi also highlighted examples of cleanliness and public participation during this year's Amarnath Yatra.He said thousands of sanitation workers served day and night on difficult routes during the pilgrimage. Over 400 metric tons of waste was collected and processed, while pilgrims also actively participated in the cleanliness efforts.According to Modi, more than 16,000 people took the cleanliness pledge, while over 10,000 received the 'Responsible Yatri' Certificate.