DNA introduces you to INS Kochi, India's latest Kolkata-class destroyer ship which has been formally inducted in the Indian Navy today. Also watch: Owing to a DNA viewer, DNA tests and analyzes how muddy roads due to heavy rains have caused havoc in Tripura and affected its economy. Today in History: On this day in 1954, USS Nautilus, a US submarine, became the world's first nuclear reactor powered submarine. Museum of Submarine History houses the submarine today. Check out our website: http://www.zeenews.com Facebook: https://www.facebook.com/ZeeNews Twitter: https://twitter.com/ZeeNews Google Plus: https://plus.google.com/+Zeenews