Cover of Freakonomics

Book · 2005 · Business & Economics

Freakonomics

A Rogue Economist Explores the Hidden Side of Everything

by Steven D. Levitt, Stephen J. Dubner · Recommended by 24 people on 14 podcasts

#50 of 13,378 books, ranked by how many different people bring it up on podcasts

mentions
74
people
24
podcasts
14
episodes
38
recommendations
4

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Freakonomics is a book that doesn't make that mistake. Freakonomics, right from the start, is a book that says, 'Hey, let me tell you something really interesting about the world using this data.'.
Tim Harford · People I (Mostly) Admire · Jan 2023 Listen at 21:49

What they say about it

Grouped from 74 mentions
  • Appreciates data and interesting facts“learn interesting things about the world”
    3
  • Inspires studying economics
    2

The best things said about it

6 of 74 · every mention
Recommended
This is from Freakonomics, highly recommend Freakonomics just if you want to learn interesting things about the world.
Ben Bowlin Stuff They Don't Want You To Know · May 2023
Recommended
Well, I would say that my favorite book of the last 20 years is Freakonomics.
David Rubenstein Freakonomics Radio · Mar 2018
Discussed
You also said in the book, and I took notes on this, that you thought Freakonomics, you saw it as an exercise in curiosity without cynicism.
Geoff Bennett Freakonomics Radio · Nov 2025
Discussed
But things like the right Queen selfish Gene right in many different Freakonomics and everyone had to read all those books to be intellectually illiterate.
Tyler Cowen Conversations with Tyler · Aug 2023
Discussed
Well, I don't know about that, but for me, the biggest thing that Freakonomics did is that it opened up options outside of academics, and honestly, much to my surprise, a lot of those activities were a lot more fun than academics.
Steve Levitt People I (Mostly) Admire · Jan 2023
Discussed
There's even I think there was a book Freakonomics, and there's a few of these things where you just shows again and again where people behave in ways that are against their best interest.
Charles Hoskinson Lex Fridman Podcast · Jun 2021

Where and when it comes up

Mentions per year

Counted mentions by episode date. Our archive is deeper for recent years; 2026 so far.

How it comes up

Recommended means the speaker tells listeners to read it.

Most mentions, by podcast

Top 9 of 14 shows

24 people who brought it up

Most recommendations first

Also: Charles Hoskinson · David Duchovny · Debbie Millman · James Altucher · John Donohue · John Green · Jonathan Anomaly · Kenneth Levvin · Richard Thaler · Seth Stephens-Davidowitz · Shaan Puri · Tim Ferriss

Why people recommend it

Freakonomics by Steven D. Levitt and Stephen J. Dubner is a groundbreaking popular economics book that applies unconventional analytical tools to explore the hidden side of everyday life. The book has been widely recommended and discussed across various podcasts. Ben Bowlin recommended the book on Stuff They Don't Want You To Know for anyone eager to learn fascinating, counterintuitive facts about the world. Annie Duke praised the authors on The Jordan Harbinger Show, highlighting Steven Levitt's fascinating online experiments involving life decisions and coin flips. A listener also mentioned via a Timcast IRL super chat that a coworker recommended the book for its brilliant exploration of correlation versus causality. Furthermore, architect Bjarke Ingels appeared as a guest on Freakonomics Radio and People I (Mostly) Admire, telling Stephen Dubner that he deeply enjoyed reading the book because of the fascinating, undoctored data sets collected by the authors. Stephen Dubner himself reflected on the legacy of the book during an anniversary episode, sharing memories of sorting through old research files and discussing how the book's impact resonated differently with readers over the years.

Every mention

74 counted mentions · 68 passing or ad reads below
Annie Duke and this actually comes from Stephen Stephen Levitt you know Freakonomics oh yeah and whatnot yeah uh go go… 1
Recommended
“and this actually comes from Stephen Stephen Levitt you know Freakonomics oh yeah and whatnot yeah uh go go see his TED Talks read Freakonomics he's wonderful”
Ben Bowlin this is from Freakonomics highly recommend uh Freakonomics just if you want to learn interesting things abo… 1
Recommended
“this is from Freakonomics highly recommend uh Freakonomics just if you want to learn interesting things about the world”
David Rubenstein Well, I would say that my favorite book of the last 20 years is Freakonomics. 1
Recommended
“Well, I would say that my favorite book of the last 20 years is Freakonomics.”
Stephen Dubner When Freakonomics happened, my biggest priority in life was having a family and raising a family and hopefu… 18
Discussed
“Plainly free economics means many things to different people.”
Discussed
“My sea of plastic boxes are stuffed with stray memories of freconomics.”
Discussed
“And one of the things that I really wanted to do with free economics was show a style of writing that was just narrative non-fiction journalism based all factual all fact checked and so on where you tell good stories as with journalism”
Discussed
“And what I do know is every day we get a lot of correspondents from people who have used something from free economics, the books or the radio show to do awesome stuff.”
Discussed
“A lot of people read and still read our books when they're young, 14, 15, 16, and then they go to college and they say, "I'm gonna study economics because I really like economics."”
Discussed
“in the first fre economics book that Steve levit and I wrote there was one chapter called what makes a perfect parent”
Discussed
“so we wrote a bit in or first and second Freakonomics books about different kinds of cheating you mentioned School teachers who looked the other way we wrote about school teachers who actually did the cheating to make their students test scores higher”
Discussed
“they were the contracts for all the foreign editions of Freakonomics that we signed when free economics first came out like the Bulgaria contract exactly we had contracts from I don't know 60 80 countries”
Discussed
“you know why I watched it is because Freakonomics was on it it was in the first season wait Freakonomics was mentioned you had a cameo who was the super smart daughter”
Discussed
“when Leva and I wrote about that argument in Freakonomics we were very careful to write it in a way that tried to make clear”
Discussed
“we wrote about this in Freakonomics in the context of all the other factors that either did or did not decrease crime”
Discussed
“And by that I mean Freakonomics was by Stephen Levitt and Stephen Dubner, and by putting us out of alphabetical order, it was like I was a star, and you were the hired hand.”
Discussed
“You want to swallow a lot of pride to write Freakonomics!”
Discussed
“Not for the cash, because honestly, even though the deal for Freakonomics was relatively large for book deals, my half wasn't that much larger than the contracts I was already getting for other books, so it wasn't really that.”
Discussed
“Obviously, our two lives would look really different if we'd never written Freakonomics.”
Discussed
“So I did think through all this, but when it worked with Freakonomics, it was just like, it wasn't so much joy like, 'Oh my God, this is great for me.'”
Discussed
“When Freakonomics happened, my biggest priority in life was having a family and raising a family and hopefully trying to live in New York City.”
Discussed
“and that's what led to our writing the Freakonomics books together and I mean we called the book Freakonomics”
Steve Levitt yeah it makes total sense to me because Freakonomics was a fluke bestseller I had never even wanted to be a… 15
Critiqued
“A lot of the content from the Hartley podcast was used in a rather snarky article that the magazine published titled, 'Why Freakonomics Failed to Transform Economics.'”
Discussed
“the main argument the article makes is that free economics is a failure because it didn't change economics but that premise is so absurd I wasn't sure it deserved rebutting because free economics is a book written for a popular audience it's my academic papers turned into interesting stories working with Steven Dubner”
Discussed
“The main argument the article makes is that Freakonomics is a failure because it didn't change economics, but that premise is so absurd that I wasn't sure it deserved rebutting because Freakonomics is a book written for a popular audience.”
Discussed
“My own experience with movies is somewhat like what you're describing; they made a documentary about our book for economics, and it played in theaters.”
Discussed
“yeah it makes total sense to me because Freakonomics was a fluke bestseller I had never even wanted to be an author”
Discussed
“Freakonomics had come out two years earlier and had been a big success”
Discussed
“So then we talked, and I have to say it took all of your persuasive powers not even to make a book like Freakonomics happen, but even to get Dubner and me to talk on the phone because I would say that we left that New York Times piece not particularly cordial because again I was super anti-social at the”
Discussed
“Jasper didn't interview me Jen Stewart read for economics and super Freakonomics and internalized them and had a conversation with me off air that made me think he was one of the smartest people I had ever met”
Discussed
“And we should say that you wrote about this in the original Freakonomics book, correct? We did, so it started out just as academic research.”
Discussed
“especially in first book for economics because we talked through a lot of that before”
Discussed
“I don't think I'm making this up; I think I remember that the publisher even initially insisted that your name had to be in a smaller typeface—you know, on the cover of Freakonomics.”
Discussed
“Have you ever gone back and read just chunks of Freakonomics or Super Freakonomics?”
Discussed
“Well, I don't know about that, but for me, the biggest thing that Freakonomics did is that it opened up options outside of academics, and honestly, much to my surprise, a lot of those activities were a lot more fun than academics.”
Discussed
“Alright, so let me ask you this, had you not written Freakonomics, do you think you would have won a Nobel Prize by now for the body of academic research you've done?”
Discussed
“Like, our book was some kind of a miracle, right, that we sold so many copies.”
Geoff Bennett Among the things that struck me in the book was that you wrote that at the outset you and Steve Levit were… 6
Discussed
“Among the things that struck me in the book was that you wrote that at the outset you and Steve Levit were bored by convention.”
Discussed
“You said at the time that the book had no central thesis.”
Discussed
“You also said in the book, and I took notes on this, that you thought freconomics, you saw it as an exercise in curiosity without cynicism.”
Discussed
“Do you regret anything you put into the freconomics books, be it opinions you voiced or takes you defended that you wished you hadn't?”
Discussed
“Claire asks, "If you could rewrite freconomics in 2025, which would be a heavy lift since it took six months to write three pages of the forward, but if you could, what's the biggest change you would make and why?”
Discussed
“Well, I'll tell you what, your work reminds us that curiosity is a civic virtue [music] and this book, the podcast, really everything that you have contributed exists as a public service.”
Steven Levitt and indeed to thank gladwell for what he did to help us i mean his blurb on the front of our book um i'm su… 5
Discussed
“and indeed to thank gladwell for what he did to help us i mean his blurb on the front of our book um i'm sure had a huge impact on our success as well”
Discussed
“so the book got kind of popular and and uh and it made so much sense to teach a course like a free economics course to the undergrads it would have had a huge enrollment”
Discussed
“um and i think a lot of uh you know another set of people have said look i don't really like freakonomics but the fact is um a lot of people a lot of kids read the book and it led some of them to be economics majors”
Discussed
“no i've never taught a course on freakonomics”
Discussed
“i tell you that the two things that are just plain wrong in the book and it's really interesting is there are two things that are not based on data or analysis”
Russ Roberts well i have a complaint because for about five years uh when i tell somebody i was an economist they'd say… 3
Discussed
“well i have a complaint because for about five years uh when i tell somebody i was an economist they'd say have you read freakonomics what do you think of it”
Discussed
“before we leave for economics i want to talk about your new ventures next but before we leave for economics i want to take an example from the book that that's always uh bothered me”
Discussed
“there are a lot of interesting and and dramatic and and provocative and hidden phenomena that you illuminate in uh in free economics a number of years have passed”
Bjarke Ingels Freakonomics has actually been a book that I really enjoyed because it is saturated. 2
Discussed
“Freakonomics has actually been a book that I really enjoyed because it is saturated.”
Discussed
“Freakonomics has actually been a book that I really enjoyed because it is saturated and because of your co-authors' ability to sort of collect all of these incredible data sets,”
Joe Rogan and oh yeah so Freakonomics I think did uh something about this too those guys 2
Discussed
“and oh yeah so Freakonomics I think did uh something about this too those guys”
Discussed
“have you ever read fre economics no okay I mean it's a great book fre economics makes a uh you know”
Tim Harford and actually it's interesting because Freakonomics is a book that doesn't make that mistake so Freakonomics… 2
Discussed
“and actually it's interesting because Freakonomics is a book that doesn't make that mistake so Freakonomics right from the start is a book that says hey let me tell you something really interesting about the world using this data”
Discussed
“Actually, it's interesting because Freakonomics is a book that doesn't make that mistake. Freakonomics, right from the start, is a book that says, 'Hey, let me tell you something really interesting about the world using this data.'”
Tyler Cowen but things like the right Queen selfish Gene right in many different Freakonomics and everyone had to read… 2
Discussed
“so a lot of the younger readers to Mr may not even be aware of like for economics being released in 2005 and there's just this onslaught of like popular economics books”
Discussed
“but things like the right Queen selfish Gene right in many different Freakonomics and everyone had to read all those books to be intellectually illiterate”
Charles Hoskinson And there's even I think there was a book Freakonomics, and there's a few of these things where you just sh… 1
Discussed
“And there's even I think there was a book Freakonomics, and there's a few of these things where you just shows again and again where people behave in ways that are against their best interest.”
David Duchovny he's made that brand his life after co-writing free economics back in 200 5 which I read back in 2005 and i… 1
Discussed
“he's made that brand his life after co-writing free economics back in 200 5 which I read back in 2005 and it blew me away”
Debbie Millman freconomics, a rogue economist explores the hidden side of everything was published in April of 2005. 1
Discussed
“freconomics, a rogue economist explores the hidden side of everything was published in April of 2005.”
James Altucher number two for economics for the next year and a half it was number two was Freakonomics I was really jealous 1
Discussed
“number two for economics for the next year and a half it was number two was Freakonomics I was really jealous”
John Donohue Years later, when you and I wrote about it in Freakonomics, where we had the time and space to really descr… 1
Discussed
“Years later, when you and I wrote about it in Freakonomics, where we had the time and space to really describe our hypothesis and approach, we didn't get any of the negative feedback we initially received.”
John Green I was not ready for that as I suspect you probably weren't ready to be the author of Freakonomics yeah whic… 1
Discussed
“I was not ready for that as I suspect you probably weren't ready to be the author of Freakonomics yeah which is nothing like I think my experience is probably nothing like yours”
Jonathan Anomaly It was in the book Freakonomics as well. So, it's a very mainstream economist who did it named Steven Levitt. 1
Discussed
“It was in the book Freakonomics as well. So, it's a very mainstream economist who did it named Steven Levitt.”
Kenneth Levvin He throws your book down freconomics. So I read it and I've been in ever since. 1
Discussed
“He throws your book down freconomics. So I read it and I've been in ever since.”
Richard Thaler you want to buy a copy of nudge the final Edition or your 15th copy of Freakonomics on Amazon 1
Discussed
“you want to buy a copy of nudge the final Edition or your 15th copy of Freakonomics on Amazon”
Seth Stephens-Davidowitz so Freakonomics I love all your books yeah to be fair just about anything you write at this point is going… 1
Discussed
“so Freakonomics I love all your books yeah to be fair just about anything you write at this point is going to get a good advance and pretty good sales”
Shaan Puri I've always thought like I think there was um a book Freakonomics wrote a book where they like look at drug… 1
Discussed
“I've always thought like I think there was um a book Freakonomics wrote a book where they like look at drug dealers and like how much work they do, and they like turns out they only make like $14 an hour for how much work.”
Tim Ferriss and it makes me think a bit of advice that I got from Steven Dubner author of Freakonomics or co-author at… 1
Discussed
“and it makes me think a bit of advice that I got from Steven Dubner author of Freakonomics or co-author at least he collaborates with Steven levit”
Mentioned on the show without a named speaker4
Discussed
“So anyway, this night of the World Series game, sleeping on the couch in your house and I was up pretty late for the game and then I couldn't sleep because I wasn't feeling well; I just stayed up all night and I wrote a version of what's the opening, the intro, the prelude of Freakonomics.”
Discussed
“a lot of people paid money to read Freakonomics now I get that that's not a company but does the University benefit from having a professor publish a popular book”
Discussed
“then Alex Dunphy is the name of the nerdy middle child on Modern Family who chose to read Freakonomics during her family's pool party this scene is part of the premiere episode of season three not as Steven said season one”
Recommended
“co-worker asked me to read a book called freakonomics the book goes on”

Also mentioned in the same episodes

Other mentions (68: passing, ad reads, own books)
Own book
“Also, it has come to my attention that many of you who listen to Freconomics Radio have never read Freconomics, which is fine, even awesome. But in case you are curious, we recently published a 20th anniversary edition of Freconomics with a new forward, and you can get it wherever you get your books.”
Own book
“I'm recording this on November 11th, 2025, which is the very day that the 20th anniversary edition of our book Freconomics [music] is being published.”
Own book
“Okay, so here's today's bonus episode starting with the new forward from the 20th anniversary edition of Freconomics.”
Own book
“It began when I wrote a piece about him for the New York Times magazine, and it flourished when we paired up to write [music] for economics.”
Passing
“He is the author with economist Steven Levit of Frecon economics, a rogue economist explores the hidden side of everything, which is now coming out with a 20th anniversary edition”
Passing
“My guest today has been Stephen Dubner. His book with Steve Levit is free for economics. Stephen, thanks for being part of Econ Talk.”
Own book
“The new edition of Freconomics, celebrating 20 years out in the world, will be published on November 11th.”
Own book
“By the way, we will soon be celebrating the 20th anniversary of our book Freconomics and the 15th anniversary of Freconomics Radio, which means I will be doing a few live events.”
Own book
“And to make it worth your while to pass along that information, I'm offering $5,000 and a signed copy of Freconomics as a finders fee for each teacher we hire who found out about the job because of the podcast.”
Own book
“I rarely do this but today I'm going to start by reading a couple sentences from Freakonomics which Steve levit and I published in 2005”
Own book
“I rarely do this, but today I'm going to start by reading a couple of sentences from Freakonomics, which Steve Levitt and I published in 2005. Cheating, we wrote, may or may not be human nature, but it is certainly a prominent feature in just about every human endeavor.”
Own book
“So you're a theoretical mathematician who, because of your applied work, has gotten to see the real world in action, and at least for me, when I wrote Freakonomics and got a taste of the real world, I was really poisoned to academics after that because I found the real world to be much more fun.”
Passing
“he inspired me to read all the Freakonomics books and he was the reason I wanted to major in economics”
Passing
“Today on Freakonomics Radio, another conversation in our ongoing look at what college is really for, with higher ed under attack from multiple angles.”
Own book
“and I am a writer and I host a podcast called Freakonomics radio and you wrote the book Freakonomics among quite a few others”
Passing
“and you wrote the book Freakonomics among quite a few others”
Own book
“and you wrote the book Freakonomics among quite a few others I did and you and I became friends”
Own book
“so let's just take super Freakonomics the second book that Steven duer and I wrote there's every reason why that should have been a huge success we had just written Freakonomics we knew how to write a book”
Passing
“All right, here it is: which word appeared in the title of a 2005 book by Stephen Levitt and Stephen Dubner that explored the hidden side of many processes?”
Own book
“when Stephen Dubner and I began writing Freakonomics we spent a few months mapping out the book together”
Passing
“because when we wrote Freakonomics we would sell more each week for like the first 10 weeks and no one had ever heard of that before either”
Own book
“and I wrote a version of what's the opening the intro the Prelude of Freakonomics”
Own book
“since Freakonomics came out there are more economics majors and”
Own book
“he sued me in federal court because he didn't like what we wrote in Freakonomics”
Own book
“I was surprised years later when governor and I wrote about in Freakonomics where we had the time and the space to really describe our hypothesis and our approaches we didn't get any of the negative feedback that you and I got”
Own book
“30 years later I can honestly say that as many papers that I've written that have policy implications I can very precisely estimate the total sum impact that my research and Freakonomics books and podcasting has had on policy and that is a big fat zero”
Own book
“I've kept an eye on his progress since then and, wow, even I've been amazed at what he's done, more or less single-handedly bringing Freakonomics-style approaches into the mainstream of medicine.”
Own book
“and we should say that you wrote about this in the original Freakonomics book correct we did so it started out just as academic research”
Passing
“This was around the time that Levitt and I published our first Freakonomics book”
Passing
“so by then we had two books for economics and super Freakonomics and we'd started Freakonomics radio”
Own book
“it brings to mind to study we described in our first Freakonomics book about a bunch of day care centers in Haifa Israel”
Own book
“if you've read his amazing book gang leader for a day or the chapter in Freakonomics called why do drug dealers live with their moms”
Passing
“you may remember sudir from the first Freakonomics book If you ever read it sudir wrote an amazing book himself called Gang leader”
Passing
“our first book Freakonomics came out and then as we were working on the second book there was a movie being made”
Own book
“and then we also wrote in super Freakonomics about something that might not strike many people's cheating”
Passing
“I think they were at a swimming pool and everybody's jumping around having fun, and she's sitting by the pool reading Freakonomics. Oh my gosh, that's so cool, Stephen!”
Own book
“I do remember the number of copies of Freakonomics that we sold the first week and it was thrilling”
Own book
“it reminds me a little bit of the argument that we made in the first Freakonomics book about names”
Own book
“back in our first Freakonomics book we did write a bit about how most people are pretty terrible at assessing risk”
Own book
“You no doubt know Stephen as the co-author of the Freakonomics books and the creator and host of Freakonomics Radio.”
Own book
“I think you're selling yourself short on how much you participate, especially in the first book Freakonomics because we talked through a lot of that before I would write—sometimes in person, sometimes on the phone—and I always took a lot of notes.”
Own book
“This was like the beginning of our starting to write Freakonomics in your office.”
Own book
“So anyway, this night of the World Series game, sleeping on the couch in your house, and I was up pretty late for the game, and then I couldn't sleep because I wasn't feeling well; I just stayed up all night, and I wrote a version of what's the opening, the intro, the prelude of Freakonomics.”
Own book
“My single favorite story about us is what happened when it came time to negotiate how we'd split the payments over Freakonomics because we had gotten this big advance to write a book together, but we'd never actually talked about who would get what share.”
Own book
“Because we got offered a bunch of money to write the book that would become Freakonomics, right?”
Passing
“Love it, and this conversation with Stephen Dubner, after this short break, they'll return to talk about what would have happened if they'd never written Freakonomics.”
Own book
“Stephen Dubner profiled me in the New York Times piece and it fundamentally changed my life Publishers came asking me to write a popular book which ended up being Freakonomics which Dubner and I wrote together”
Own book
“Like Michael Lewis wrote about you a long time ago, Stephen Dubner profiled me in a New York Times piece, and it fundamentally changed my life. Publishers came asking me to write a popular book, which ended up being Freakonomics, which Dubner and I wrote together.”
Own book
“after Freakonomics came out and we had some success in terms of publishing there was a historian that I knew and I was at a seminar he was at and clearly within my earshot he grumbled that he would never want a wide audience to read his scholarship”
Own book
“After "Freakonomics" came out and we had some success in terms of publishing, there was a historian that I knew, and I was at a seminar he was at, and clearly within my earshot, he grumbled that he would never want a wide audience to read his scholarship, with clearly a reference to the fact that I had somehow degraded”
Passing
“when Steve and Devon and I wrote for economics I realized that the outside world was much more fun than the academic world”
Own book
“and of the theory we wrote about in our first Freakonomics book way back in 2005”
Own book
“I wish I could give such a noble reason for why Stephen devner and I wrote Freakonomics because the simple fact is that we just wrote it for the money the Publishers offered us a lot of money to write a book and we didn't actually think anyone would read it”
Own book
“in the first free economics book published in 2005 Steve levit and I wrote about one such consequence of the original roie Wade ruling”
Own book
“if you've ever read fre conomics the namesake book of this show you may recall this controversial link between legalized abortion and the fall of crime”
Own book
“it's Steve levit my fre economics friend and co-author”
Own book
“in the first Freakonomics book that Steve Levitt and I wrote there was one chapter called what makes a perfect parent”
Passing
“so when you and Levitt were writing Freakonomics it was all dubner's voice right”
Own book
“first years ago I was writing the book about the psychology of money I was going to call it money makes me happy except when it doesn't but I ended up putting that book in a drawer when I met Steve Levitt an economist at the University of Chicago and instead we wrote Freakonomics that's turned out pretty well”
Passing
“stephen levitt on freakonomics and the state of economics and dwayne betts on reading prison and the million brook project”
Passing
“and with stephen dubner he is the author of the free economic the book for economics and the creators of all things freakonomic”
Own book
“I'm one of the co-authors of the Freakonomics book series, and I also host Freakonomics Radio”
Own book
“And you wrote the book Freakonomics, among quite a few others. I did.”
Passing
“Stephen Dubner is an award-winning author, journalist, and podcast and radio host. He is co-author of the popular Freakonomics book series and host of Freakonomics Radio and podcast available on Spotify.”
Own book
“So she assembled some data, which included the lists that we created for our first book, Freakonomics, of the whitest and blackest names among baby boys and girls.”
Own book
“The early episodes were an offshoot of the Freakonomics books I was writing with this guy.”

Portraits from Wikimedia Commons: Tim Harford, PopTech / Wikimedia Commons (CC BY-SA 2.0); Tyler Cowen, Tyler Cowen / Wikimedia Commons (CC BY-SA 3.0); Charles Hoskinson, Charles Hoskinson / Wikimedia Commons (CC0); Annie Duke, Annie Duke / Wikimedia Commons (CC BY-SA 4.0); Stephen Dubner, Audrey S. Bernstein / Wikimedia Commons (CC BY-SA 4.0); Steven Levitt, Stephen Foskett / Wikimedia Commons (CC BY-SA 2.0); Joe Rogan, The White House / Wikimedia Commons (Public domain).