India, April 25 -- Even with bustling malls, blinking hoardings and swarms of people, big cities can breed loneliness. Isolation in top metropolises is a rising malaise, and it's getting people to lean on the most banal things for company. For instance, in South Korea, a recent report showed that South Korean millennials are keeping pet rocks as company to combat burnout and pangs of loneliness. It's telling of how urban isolation and sadness are rampant across the world....