Shelling from across the border has been an unusual routine for the last two decades in the life of Lt Col (Retd) Vivek Sharma. There was nothing more indefinite about life than the definite possibility of falling dead – at least till the retired armyman encountered something that took the world by surprise last year. A year and nearly 35 lakh deaths later, the Covid-19 pandemic has redefined uncertainty in an altogether different way to the world, stoking fear and striking alarm bells.