FRONT PAGE Crack down on cow vigilantes, PM tells States NATIONAL Super-flexible and strong artificial silk developed Govt. panel to study cow derivatives 3D-printed, functional heart made INTERNATIONAL U.S. opened door to Iran’s domination in Iraq OPINION Back to the classroom When too much is too little Changing contours of the Darjeeling agitation Readers are our mirrors The past catches up A looming threat Cash is not trash Looking at China BUSINESS ‘RBI push to resolve Rs. 8 lakh cr. bad loans’