New Delhi, June 13 -- The financial backbone and the political nerve-centre of our country are both reeling. And the worst is still yet to come. With the biggest single-day jump in cases this week, it's critical to understand what is going on in Mumbai and Delhi - that along with Ahmedabad and Chennai - have become the cities to worry about. As part of my now-16,000 kilometre journey across India reporting the pandemic, I have spent considerable time studying the medical infrastructure in both places, apart from tracking deaths at graveyards and crematoriums....