If you are a procrastinator, you’re in good company. Some of the greatest minds in the world — including Leonardo da Vinci — were famous procrastinators. Journalist Andrew Santella explores the upside of putting things off in his new book, Soon: An Overdue History of Procrastination, from Leonardo and Darwin to You and Me . It’s a funny and insightful look at how we’ve become so good at getting distracted — and why it’s not always such a bad thing, unless you want to be more productive. Santella confessed that he was looking to justify his own habit of putting things off when he started research for the book, and he freely admits to procrastinating in the writing of it. He recently joined the Knowledge at Wharton radio show on SiriusXM  — on time — to explain how procrastination can be a positive human foible. (Listen to the podcast at the top of the page.) An edited transcript of the conversation follows. Knowledge at Wharton: Why did you procrastinate in writing this book?…