More than a year into the pandemic, scientists are still debating Covid-19’s origins. WSJ breaks down key events in three locations in China – a seafood market, a lab and a mine – to piece together how the global health crisis might have started. Photo composite: George Downs 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