Mukesh Sahay, the former Director General of Police in Assam, is one such individual. After 34 years of service in the police force, he is now a full-time Mathematics teacher. Barely a week after his retirement, Sahay took up his new role at the Sonaram Higher Secondary School in Guwahati’s Bharalumukh area. former top cop now takes one-hour classes on Calculus every day of the week. But he’s ever more ready to take on even further classes.