India's Covid-19 crisis has resulted in record numbers of cases and deaths. WSJ breaks down the chain of events that led to the fastest-growing wave of infection since the pandemic started, and what it means for the world. Photo: Samuel Rajkumar/Reuters More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook: https://www.facebook.com/pg/wsj/videos/ On Twitter: https://twitter.com/WSJ On Snapchat: https://on.wsj.com/2ratjSM #WSJ #India