Jody Rosen is a contributing writer at the New York Times Magazine and a bike nut who has just published a rousing (and sometimes arousing) book called “Two Wheels Good: The History and Mystery of the Bicycle.” Today, he takes us on a rollicking ride through the two-wheeled revolution, revealing the surprising ways bicycles have shaped the world in which we live. This and That: » Download the Next Big Idea app » Learn more about Transportation Alternatives » Check out the plans to build pedestrian and cycling bridges in NYC

What do we lose when we avoid sorrow and chase empty delights, when we mask our pain and feign cheerfulness, when we profess to have no regrets and insist on turning every frown upside down? Those questions are at the heart of two new books by our curators Susan Cain (“Bittersweet”) and Daniel Pink (“The Power of Regret”). Today on the show, they sit down with Rufus to swap notes on the writing process, share what they’ve learned from each other, and imagine what the world might look like if we all learned how to embrace negative emotions. Show Notes: » Check out our previous interviews with Susan and Dan » Use the code PODCAST20 at nextbigideaclub.com for 20% off an express membership