There was a time when seeing was believing — but that’s changing, thanks to new technology that’s elevating fakery to a whole new level. In an ever-growing world of synthesized realities, how do we tell what’s real from what’s fake? And when and why does it matter?

We explore that question on this episode, with stories about deepfakes — a new kind of fake video, powered by artificial intelligence; lab-grown meat in our pets’ food; and fake laughter.

Also heard on this week’s episode: