Two years ago, Walter Isaacson, the legendary biographer who has written books about Steve Jobs, Albert Einstein, Benjamin Franklin, and Leonardo da Vinci, began shadowing Elon Musk. "I started off with a guy who was one of the most popular people on the planet," Isaacson says, "and ended up with a guy who's the most controversial." Today on the show, Isaacson unpacks those controversies.

We go through at least thirty-six major changes in the course of our adulthoods. And yet adapting to those changes is really, really hard. Why is that? Health and science writer Brad Stulberg says it's because our model for change is broken. Luckily, he's here to fix it. Guest: Brad Stulberg Book: "Master of Change: How to Excel When Everything Is Changing – Including You" Host: Caleb Bissinger

In the 1950s, Shaker Heights, Ohio, became a national model for housing integration. In the 1970s, it was known as a crown jewel in the national move to racially integrate schools. So why is its school system now struggling to close a yawning racial achievement gap? Guest: Laura Meckler Book: “Dream Town: Shaker Heights and the Quest for Racial Equity” Host: Caleb Bissinger • Download the Next Big Idea app: nextbigideaclub.com/app

Increasing longevity and the explosion of technology are reshaping the world. What will it mean for your education, your career, and your life? • Mauro Guillén’s new book is “The Perennials: The Megatrends Creating a Postgenerational Society” • Download The Next Big Idea app at nextbigideaclub.com/app

Ultra-processed food makes up 60 percent of the American diet. Though to call it food is a stretch. Because it is not, strictly speaking, food at all. It is an industrially produced edible substance. And it’s killing us. That is the nauseating conclusion Chris van Tulleken reaches in his new book, “Ultra-Processed People: The Science Behind Food That Isn’t Food.” Today, he explains how big businesses have corrupted our diets and what we can do to stop them from causing further harm.