‘Hooked’ author Nir Eyal on why personal assistant apps are the next big trend

GUEST: Whenever I feel uncomfortable writing about a topic, that’s when I know I should write about it. So here goes. This article is about how a new way of designing apps changed my life. But to explain the power of this trend, I need to tell you about poop. That’s the uncomfortable part.
For the past five years or so, I’ve struggled with intestinal discomfort. (I’ll spare you the gory details.) I spent countless hours crawling the web searching for a possible diagnosis