How the Notre-Dame Cathedral Fire Spread

https://www.nytimes.com/interactive/2019/04/15/world/europe/paris-notre-dame-fire.html?utm_campaign=the_download.unpaid.engagement&utm_source=hs_email&utm_medium=email&utm_content=71836962&_hsenc=p2ANqtz-_Mjd3_tPCvtI0jmcZfaN1xBZdkERu0dI34nS73wAIjMlMfmzP7E1YUMg3FWL4TrtSNTN6VPMddLhUZ9h3_TR0Gp4Xk8sUIC6fUQThJ-mlWkkOffLE&_hsmi=71836962