Why did Elon Musk buy Twitter? What does he plan to do with it? Is this the end of big social or a chance to reinvent it? This week, we’re interrupting our regularly scheduled programming to answer those questions with two of the smartest internet commentators we know: Eli Pariser, co-founder of Upworthy and author of “The Filter Bubble”; and Steven Johnson, writer, podcaster, and TV host. RECOMMENDED: Subscribe to Steven’s newsletter, Adjacent Possible: adjacentpossible.substack.com Follow Eli on Twitter: @elipariser Listen to our interview with Jill Lepore about Elon Musk’s sci-fi fantasies. GET IN TOUCH: What did you think of this episode? Send us your thoughts: podcast@nextbigideaclub.com NEXT BIG IDEA APP: You know what’s better than mindlessly scrolling through Twitter? Reading an entire book in just 12 minutes. Impossible, you say? Well, clearly you haven’t downloaded the Next Big Idea app, the only place in the world where you can hear book summaries read by leading authors themselves. Download it today: nextbigideaclub.com/app 

Thousands of years ago, humans crossed a land bridge from Siberia into Alaska. They tried to move south, but a two-mile-high, coast-spanning ice wall stood between them and the rest of the continent. How did they get past it? Scholars have fought over that question for decades. But in her book, “Origin,” Jennifer Raff says breakthroughs in genetics have given scientists an entirely new understanding of how the Americas were peopled and what happened in the millennia that followed. Next Big Idea Club — Want to hear 12-minute book summaries written and read by the authors themselves? Download the Next Big Idea app today at www.nextbigideaclub.com/app