Traffic almost came to a standstill 2km (1.2 miles) from the Shanghai Expo Centre on Friday, the first day of the World Artificial Intelligence Conference (WAIC). With temperatures nearing 40 degrees Celsius (104 degrees Fahrenheit), scores of attendees abandoned their taxis to walk the rest of the way under the hot sun. This year’s conference mirrored the weather: it was the hottest, most crowded WAIC in my six years covering the event and, I was told, the most vibrant since its inception in...