Earlier this summer, I walked through the glassy lobby of a fancy office in London, into an elevator, and then along a corridor into a clean, carpeted room. Natural light flooded in through its windows, and a large pair of umbrella-like lighting rigs made the room even brighter. I tried not to squint as I...

This is today's edition ofThe Download,our weekday newsletter that provides a daily dose of what's going on in the world of technology. Synthesia's AI clones are more expressive than ever. Soon they'll be able to talk back. -Rhiannon Williams Earlier this summer, I visited the AI company Synthesia to give it what it needed to...