What happens when you put your phone in airplane mode, walk out your front door, and don’t come home for 12 hours? Our producer Caleb finds out, with help from adventurer Colin O’Brady.

» To learn more about Colin’s new book, “The 12-Hour Walk,” visit 12hourwalk.com

» Want to hear hundreds of leading authors summarize their books in 12 minutes or less? Download the Next Big Idea today: nextbigideaclub.com/app/