Fireworks attached to bottles of Champagne sent up showers of sparks that appear to have ignited insulation in a bar. The blaze killed 40 people. By Ségolène Le StradicAurelien Breeden and Thomas ...

A tool for spotting pancreatic cancer in routine CT scans has had promising results, one example of how China is racing to apply A.I. to medicine’s tough problems. By Vivian Wang and Andrea Verdelli ...