Cover of The 4-Hour Body

Book · 2010 · health

The 4-Hour Body

by Timothy Ferriss · Recommended by 16 people on 10 podcasts

#148 of 16,745 books, ranked by how many different people bring it up on podcasts

mentions
38
people
16
podcasts
10
episodes
29
critical mentions
0

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My first question for you is about your mindset around the time that you wrote The 4-Hour Body and The 4-Hour Work Week, but in particular, The 4-Hour Body, because the protocols in that book are so very useful.
Andrew Huberman · Huberman Lab · Jun 2023 Listen at 10:00

What they say about it

Grouped from 38 mentions
  • Reads and re-reads the book“gleaned so much knowledge from that book”
    6
  • Follows the slow carb diet“slow carb diet”
    4
  • Listen to the Blinkist version“listen to the Blinkist version”
    3

The best things said about it

5 of 38 · every mention
Recommended
Blinkist has terrific books available. For instance, I'm a big fan of Tim Ferris's 4-Hour Body, gleaned So much knowledge from that book.
Andrew Huberman Huberman Lab · Jul 2022
Recommended
That podcast 4-hour 4-hour workweek 4-hour body um especially um had a tremendous impact in accelerating my career in science because I was able to focus on things that really matter.
Andrew Huberman My First Million · Nov 2021
Discussed
The most highlighted books in Kindle history at some point were the ESV Bible, The 4-Hour Body, The One-Year Bible, and then The 4-Hour Workweek.
David Perell How I Write · Dec 2023
Discussed
I always call it the '4-Hour Diet,' but the Slow Carb Diet works extremely well; anytime I've followed it, I get much leaner and stronger and all that stuff it’s purported to do—it works.
Tim Ferriss Huberman Lab · Jun 2023
Discussed
Tim Ferris, the great Tim Ferris, deserves recognition for being about ten years ahead of many trends in nutrition and skill learning; many of the things he predicted in his books, 'The Four Hour Body' and 'The Four Hour Chef,' have been supported by scientific data, some of which comes from studies on animal models, and some of which have.
On the show Huberman Lab · Mar 2022

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 10 shows

16 people who brought it up

Most recommendations first

Also: Matt Maruca · Neil deGrasse Tyson · Sam Parr · Shaan Puri

Why people recommend it

The 4-Hour Body by Timothy Ferriss is a comprehensive, data-driven guide to physical optimization, covering unconventional health experiments, fat loss, and muscle building. The book has been frequently endorsed and discussed across major podcasts. On Huberman Lab, Andrew Huberman repeatedly recommended the work, noting that he gleaned a tremendous amount of knowledge from its pages and occasionally listens to summaries via Blinkist. Huberman also credited Tim Ferriss's broader body of work on My First Million with accelerating his scientific career by teaching him how to focus on what truly matters. Joe Rogan praised Ferriss and his publications on multiple episodes of The Joe Rogan Experience, encouraging listeners to purchase the guides and highlighting the author as a brilliant and unique individual. More recently, Tim Ferriss himself addressed the book on an episode of The Tim Ferriss Show, where he answered listener questions regarding whether the slow-carb diet and foundational principles still apply to older adults. Ferriss also shared that he was actively using Occam's protocol from the book to build muscle mass in preparation for surgery, proving the enduring practical value of his physical optimization frameworks.

Every mention

38 counted mentions · 89 passing or ad reads below
Andrew Huberman Blinkist has terrific books available. For instance, I'm a big fan of Tim Ferris's 4-Hour Body, gleaned So… 10
Discussed
“My first question for you is about your mindset around the time that you wrote The 4-Hour Body and The 4-Hour Work Week, but in particular, The 4-Hour Body, because the protocols in that book are so very useful.”
Discussed
“I'm curious about some of the things you've mentioned in 'The 4-Hour Body' and that you've talked about today, like accelerometers, continuous glucose monitors, deliberate cold exposure—how many of these things are you still doing regularly, and how often do you use them?”
Discussed
“There are strategies you can employ to mitigate that damage; there's actually a whole chapter in 'The 4-Hour Body' titled 'Damage Control.'”
Discussed
“I was following The 4-Hour Body slow carb diet.”
Discussed
“Some women might want a big neck, but, in general, the two things that can — and you put some of this in The 4-Hour Body.”
Recommended
“Blinkist has terrific books available. For instance, I'm a big fan of Tim Ferris's 4-Hour Body, gleaned So much knowledge from that book.”
Discussed
“Other books that I've read before and that I own and enjoy, but I listened to the Blinkist version of from time to time are things like Tim Ferris's "The 4-Hour Body" or Tim Ferris's The 4-Hour Chef book, both of which are excellent or Nassim Taleb's "The Black Swan" and there are many other titles as well.”
Recommended
“Other books I've previously read and own, but listen to the Blinkist version of occasionally, include Tim Ferris's 'The 4-Hour Body,' Tim Ferris's 'The 4-Hour Chef,' Nassim Taleb's 'The Black Swan,' and many other titles.”
Recommended
“I've used it for, for instance, Matt Walker's "Why We Sleep," an excellent book on why we sleep as well as Tim Ferriss's "The 4-Hour Body," Nassim Taleb's "The Black Swan," and so on, and so on.”
Recommended
“That podcast 4-hour 4-hour workweek 4-hour body um especially um had a tremendous impact in accelerating my career in science because I was able to focus on things that really matter.”
Joe Rogan Tim Ferris 4hour work week. The 4hour body. Go buy his books, ladies and gentlemen. 4
Discussed
“it's so weird that tim ferriss who uh is all about biohacking and all about like you know the four hour body the four hour work week he didn't put it in his book”
Recommended
“Tim Ferris has some really crazy cool [ __ ] to tell us and he's a fascinating and really unique individual so if you've never heard of him he's the author of The 4-Hour Work Week the 4-Hour Body and just a brilliant dude and a great guy”
Discussed
“I've been reading his book the 4our uh work well the 4-Hour Body is the one I've been reading it's so [ __ ] informative”
Recommended
“Tim Ferris 4hour work week. The 4hour body. Go buy his books, ladies and gentlemen.”
Tim Ferriss Is related to the four-hour body. All right. This is a question from Duncan Hi, Tim. Do you think the basic… 9
Discussed
“Is related to the four-hour body. All right. This is a question from Duncan Hi, Tim. Do you think the basic principles in the four-hour body still apply to those over 40 over 50, etc? Specifically I'm thinking about slow-carb diet”
Discussed
“I'm in prep for surgery. I'm using Occam's protocol from that book to Increase muscle mass with the expectation That I will have quite a bit of atrophy in the four to six weeks Post surgery.”
Discussed
“Continued to resonate in different subject matter from the 4-hour work week with business and entrepreneurship to the 4-hour body with physical performance and interviewing coaches...”
Discussed
“And that's when I went to The 4-Hour Body, totally different category. A lot of people assumed, within publishing, totally different readership.”
Discussed
“That's the important thing. Tim Ferriss: I did. Including some of my close friends, like Matt Mullenweg who I mentioned. He was like, "Yeah. Of course."”
Discussed
“if I'm writing a chapter, say, you can look at this in the 4-Hour Body in [inaudible 00:57:38], right? I'm starting in the action almost always.”
Discussed
“I would say that for The 4-Hour Body, for instance, it'd be like, What is the minimal effective dose for the 10 most important dimensions of physical fitness?”
Discussed
“I always call it the '4-Hour Diet,' but the Slow Carb Diet works extremely well; anytime I've followed it, I get much leaner and stronger and all that stuff it’s purported to do—it works.”
Discussed
“Tim, it's been over a decade since the 4-Hour Body. If you had to revise it, what would you change?”
Chris Williamson only yesterday tim ferriss guy that wrote the four-hour work week and the four-hour chef and the four-hour… 2
Discussed
“why is the 4our body back in the charts the before our body is back in the charts”
Discussed
“only yesterday tim ferriss guy that wrote the four-hour work week and the four-hour chef and the four-hour body this unbelievably well-known new multiple times new york times best-selling author”
Alan Donegan uh he wrote the four-hour work week he wrote the four hour body and different books and his blog and his po… 1
Discussed
“uh he wrote the four-hour work week he wrote the four hour body and different books and his blog and his podcast have definitely had an impact on my life”
Brad Barrett And I know yeah I I even still go back to your 4-hour body Tim it's hilarious I'm still doing the uh the my… 1
Discussed
“And I know yeah I I even still go back to your 4-hour body Tim it's hilarious I'm still doing the uh the myotic crunch and the cat's vomit...”
Dave Rubin because I you know Ferriss Tim Ferriss is the one that sort of did the slow carb thing or the 4-hour body w… 1
Discussed
“because I you know Ferriss Tim Ferriss is the one that sort of did the slow carb thing or the 4-hour body whatever it is”
David Perell The most highlighted books in Kindle history at some point were the ESV Bible, The 4-Hour Body, The One-Yea… 1
Discussed
“The most highlighted books in Kindle history at some point were the ESV Bible, The 4-Hour Body, The One-Year Bible, and then The 4-Hour Workweek.”
Derek Sivers It actually reminded me of something you said in The 4-Hour Body about yoga studios that no, it’s not the b… 1
Discussed
“It actually reminded me of something you said in The 4-Hour Body about yoga studios that no, it’s not the best thing for your health, but it’s a more profitable pitch for them to sell you a yoga studio instead of the free weights.”
Dr. Andy Galpin I think I'm pretty sure I don't can't guarantee it but I'm pretty sure Tim Ferris wrote about this in 4-Hou… 1
Discussed
“I think I'm pretty sure I don't can't guarantee it but I'm pretty sure Tim Ferris wrote about this in 4-Hour Body right 15 years ago or whatever right having an apple before bed having some sort of slow relasing glycemic index carbohydrate can really stabilized blos and he nailed it he was he was dead on man”
Hugh Jackman and I learned a lot of this from your book and I worked at a gym by the way the 4H hour body 1
Discussed
“and I learned a lot of this from your book and I worked at a gym by the way the 4H hour body”
Jeff Garlin why we get fat and the for our body oh yeah ok tonight it's at Ferris and I learned stuff from both 1
Discussed
“why we get fat and the for our body oh yeah ok tonight it's at Ferris and I learned stuff from both”
Matt Maruca so it involves eating just like Tim Ferris recommends in his uh the 4-Hour Body in the Slow Carb Diet it's… 1
Discussed
“so it involves eating just like Tim Ferris recommends in his uh the 4-Hour Body in the Slow Carb Diet it's like 50 grams of protein within 30 minutes of waking Tim Ferris did 30 grams”
Neil deGrasse Tyson so the 4-hour body was the same what are the hidden assumptions that are limiting the flower's body 1
Discussed
“so the 4-hour body was the same what are the hidden assumptions that are limiting the flower's body”
Sam Parr Intermittent fasting, people like I don't fast. Ferriss in the 4-Hour Body was like, 'No, no, no, protein r… 1
Discussed
“Intermittent fasting, people like I don't fast. Ferriss in the 4-Hour Body was like, 'No, no, no, protein right away, right when you wake up.'”
Shaan Puri Tim Ferris did that a little bit with the 4our body where he tried things that weren't crazy but he did a r… 1
Discussed
“Tim Ferris did that a little bit with the 4our body where he tried things that weren't crazy but he did a really good job of explaining it and making that part of his identity”
Mentioned on the show without a named speaker1
Discussed
“Tim Ferris, the great Tim Ferris, deserves recognition for being about ten years ahead of many trends in nutrition and skill learning; many of the things he predicted in his books, 'The Four Hour Body' and 'The Four Hour Chef,' have been supported by scientific data, some of which comes from studies on animal models, and some of which have”

Also mentioned in the same episodes

Other mentions (89: passing, ad reads, own books)
Passing
“Then I was like, let me pick something that I will enjoy just having on an endless loop All night long right, I might watch babe like for the four-hour body I watched babe like Eight times in the evening that adds up real fast”
Passing
“It is the great Force multiplier not to overuse that but I recall and I wrote about this in the introduction to the four-hour body”
Plugged
“What workouts from The 4-Hour Body are you still prioritizing in your routines? There's There's a lot from The 4-Hour Body.”
Plugged
“And I would also just point to for instance the the slow carb diet and the 4-hour body. It is not a ketogenic diet, right? You're consuming legumes, you're consuming a lot of fiber in the form of beans or lentils, etc.”
Plugged
“Say you look at the 4-hour body and then the subsequent 10 15 years a lot of that played out and ended up being very very highly reinforced by science.”
Plugged
“And the biggest difference, I'd say the absolute biggest difference between the 4-hour chef and the books that came before it, the 4-hour work week and the 4-hour body, is that in the case of the 4-hour body, I did all of the experiments, then digested it all, combed through everything, and compiled the book.”
Plugged
“because I think I I have and it I'm partially to blame for this cuz I did a lot of really out there stuff in say The 4-Hour Body, which uh much of which most of which stands up to scrutiny now, 15 years later.”
Plugged
“So, yeah, it's been uh yes, the for our body was 2010, which meant I started writing in 2008.”
Plugged
“And the fact of the matter is when I wrote the 4-hour body, people were like, 'Oh my god, you want us to repeat the same meals over and over again?' I'm like, 'What did you have for breakfast the last 5 days?'”
Plugged
“For the OGs in the audience, go back and look for glute for in the for our body. It's in there.”
Plugged
“And then we connected and Charles ended up in the 4-hour body. He introduced me to myofascial release and active release technique.”
Plugged
“So, when I launched the 4-hour body, I had a huge audience from the first book that was waiting for my next book. I could have made tens of millions, maybe a hundred million plus, by launching a supplement brand to capitalize on every one of my main product recommendations.”
Plugged
“Polycosinol is the only thing the P of PG that I would put on the question mark chopping block if I were to update the 4hour body. That's the only thing in the entire book where I'm like evidence was split.”
Plugged
“and so intermittent fasting would certainly be if you were to ask me if you could only add one chapter to the 4-hour body, what would it be about? It would be about intermittent fasting.”
Plugged
“I used to do this when I was writing my books. So 4hour work week. I don't even know if you know this. So 4-hour work week, 4-hour body, 4 hour chef.”
Plugged
“4-Hour Body, same story. Like a lot of that stuff is in the news now. Came out 2010, right?”
Passing
“For those of you who aren't familiar with Tim, he's the author of multiple best-selling books, including the 4-Hour Work Week, 4Hour Body, and Tools of Titans.”
Passing
“You're like, 'Sorry, I'm in town. I'm just doing the 4-hour body. I've got some meetings tomorrow, so I can't do it.' And politely excuse yourself.”
Plugged
“There's a book called Bad Science that I actually excerpted for the 4-Hour Body at one point just to give you an idea of what matters and what doesn't because a lot gets sensationalized in the news.”
Plugged
“I wrote about this in the 4-hour body, and I know you were pretty skeptical at first of the glutamine.”
Plugged
“So, in the case of say the 4-Hour Body, the Occam's protocol and a handful of compound movements still does the trick for the vast majority of the population.”
Plugged
“There is a chapter in The 4-Hour Body called Reversing Permanent Injuries. I will link to it for folks, but the exercises in that still deliver so much like the bang for the buck in doing some of the Grey Cook exercises...”
Plugged
“so we can do the three-hour work week and the two-hour work week so fine if it makes him happy to do this stupid thing called 4our body and that's not what the publisher said but they were more excited for me to stay in my Lane the 4-Hour Body then proved to me I could experiment outside of the”
Plugged
“then I ended up putting that as an appendix in the 4our body”
Plugged
“it's a straightforward from four our body and then super slow as applied”
Plugged
“I mean I'm pretty old school I mean I listen to shingo Nakamura quite a bit for like chill mixes dead mouse pretty old school but I I wrote 4our body to a continuous mix like a three-hour set of dead mouse”
Plugged
“I actually recommended AG1 in my 2010 bestseller, more than a decade ago, The 4-Hour Body, and I did not get paid to do so.”
Plugged
“I actually recommended ag1 in my 2010 best seller more than a decade ago the 4-Hour Body and I did not get paid to do so”
Ad read
“I actually recommended ag1 in my 2010 best seller more than a decade ago the 4-Hour Body and I did not get paid to do so”
Plugged
“I actually recommended ag1 in my 2010 best seller more than a decade ago the 4-Hour Body and I did not get paid to do so I simply loved the product”
Plugged
“I actually recommended ag1 in my 2010 best seller more than a decade ago the 4-Hour Body and I did not get paid to do so”
Passing
“It turns out I was right with everybody else, but one thing was I had read the 4-Hour Work Week by Tim Ferris, and I actually had read the 4-Hour Body first because I was obsessed with fitness. I thought okay, if he's gamifying this, how else is he gamifying things?”
Passing
“all the 4our work week for the 4our body you know I've heard their fine books”
Plugged
“I actually recommended ag1 in my 2010 best seller more than a decade ago the 4-Hour Body and I did not get paid to do so I simply loved the product and felt like it was the ultimate nutritionally dense supplement that you could use conveniently while on the run which is for me a lot of the time”
Plugged
“nonetheless I've been doing this a long time in the 4our body in 2010”
Passing
“4-Hour Workweek, 4-Hour Body, 4-Hour Chef and then Tools of Titans and Tribe of Mentors.”
Plugged
“I recommended it in The 4-Hour Body in 2010 and did not get paid to do so.”
Passing
“for our body, whatever.”
Plugged
“So looking for an elegant refinement in so much as I might approach something like Occam's Protocol in The 4-Hour Body, which I've ended up following, again, roughly the same as it was published in 2010 in The 4-Hour Body.”
Plugged
“What would I add to 4-Hour Body if I wrote it today from a name that I cannot pronounce? I would probably add a chapter on fasting.”
Plugged
“I have been following the slow-carb diet, as described in The 4-Hour Body. You can find it online.”
Plugged
“And if you look at, for instance, what I wrote in The 4-Hour Chef and The 4-Hour Body, but especially in The 4-Hour Chef as it related to accelerated learning, failure points, identifying the failure points and removing as many failure points as possible.”
Plugged
“I recommended it in The 4-Hour Body in 2010 and did not get paid to do so.”
Plugged
“I recommended it in The 4-Hour Body in 2010 and did not get paid to do so.”
Plugged
“Well, I will say that as you're talking, my father for instance has in the last — it's been very fast actually, maybe in the last two to three months has lost 50 pounds. And he's done that by following the slow-carb diet in The 4-Hour Body as described by The 4-Hour Body.”
Plugged
“I recommended it in The 4-Hour Body in 2010 and did not get paid to do so.”
Ad read
“I recommended it in The 4-Hour Body in 2010 and did not get paid to do so. I do my best with nutrient-dense meals, of course, but AG1 further covers my bases with vitamins, minerals, and whole-food-sourced micronutrients”
Passing
“I recommended it in The 4-Hour Body in 2010 and did not get paid to do so.”
Plugged
“and I would say that's probably when I made the pitch for the four-hour body”
Plugged
“then the for our body was published in 2010 which means that I was probably working on it for two years”
Plugged
“his books the 4-Hour chef and the 4-Hour Body and the 4-Hour Work Week not only explain his own exploration of how to optimize and prioritize his time and learn particular skills”
Passing
“His books, The 4-Hour Chef, The 4-Hour Body, and The 4-Hour Work Week not only explain his own exploration of how to optimize and prioritize his time and learn particular skills but also teach you those skills as well.”
Plugged
“Yeah, I mean, I’m not being judgmental; I think that there's validity in lots of those pockets, and there's stuff that's wrong in lots of those pockets. Yeah, there are diets that work extremely well—like the '4-Hour Diet' or Slow Carb.”
Plugged
“For instance, in the '4-Hour Body,' I took a look at the potential effect of cell phones or the proximity of cell phones to, say, gadal function and reproductive health, and the literature that was available at the time was very limited.”
Plugged
“So if people want to learn more about that, they should go to Tim's blog on the 4-Hour Body and the Slow Carb Diet.”
Plugged
“I recommended it in The 4-Hour Body in 2010 and did not get paid to do so.”
Plugged
“I recommended it long ago in my 2010 number one New York Times best-seller, The 4-Hour Body, and I did not get paid to do so.”
Plugged
“I recommended it long ago in my 2010 number one New York Times bestseller, The 4-Hour Body, and I did not get paid to do so.”
Plugged
“I've felt this way for a long time, since predating The 4-Hour Body.”
Plugged
“And it was for The 4-Hour Body hitting number one New York Times. That's why I have the saddles. Yeah.”
Plugged
“I recommended it in The 4-Hour Body in 2010 and did not get paid to do so.”
Plugged
“I recommended it in The 4-Hour Body in 2010 and did not get”
Plugged
“You can still use one-time-only PR approaches, much like I really targeted Digg.com, D-I-G-G.com, founded by my friend Kevin Rose way back in the day to try to get on the homepage for launching The 4-Hour Body because I understood the power of Digg at that time for acting as a front-page shopping list, a tastemaking service of sorts, much”
Plugged
“I recommended it in The 4-Hour Body in 2010 and did not get paid to do so.”
Plugged
“and the four-hour body and that is using accountability and incentives”
Ad read
“For example, I'm a fan of Tim Ferris's *4-Hour Body*, which has provided me with much knowledge, as well as Nassim Taleb's *The Black Swan* and Matt Walker's *Why We Sleep*, the latter being a book I've read several times and frequently listen to summaries of on Blinkist due to the many takeaways it offers.”
Plugged
“i recommended it in fact in the four-hour body this is more than ten years ago and i did not get paid to do so”
Ad read
“I've used it for example with Matt Walker's 'Why We Sleep,' an excellent resource on sleep, as well as Tim Ferriss's 'The 4-Hour Body,' Nassim Taleb's 'The Black Swan,' and many others.”
Plugged
“And many of the updates that I would have put into The 4-Hour Work Week, um but more so The 4-Hour Body and The 4-Hour Chef were added into Tools of Titans.”
Plugged
“And in fact, I had looked at David Goggins back in 2009, 2010 as it related to the endurance chapters in the 4-Hour Body, but ended up not being able to connect with him in time to include something for publication.”
Plugged
“I think in part how Jeffrey initially connected us is because of kind of 4our body slow carb diet and so on”
Plugged
“I'm going to do another CGM experiment soon because the last time I did a continuous glucose monitor experiment was in 2008 or n for the 4-Hour Body with the version one Dexcom which you had to implant in your abdomen”
Plugged
“which is why given the success of the book i decided to maintain preserve the the brand recognition of four hour but move it into physical performance with the four hour body”
Plugged
“I view it as all-in-one nutritional insurance. I recommended it, in fact, in The 4-Hour Body. This is more than 10 years ago and I did not get paid to do so.”
Plugged
“and it allows me to do things i would normally need a much larger gym for like cable chop and lift or rotational exercises things i wrote about in the four hour body”
Plugged
“I recommended it in fact in the four hour body this is more than ten years ago and i did not get paid to do so”
Plugged
“i've used tonal for multiple workouts now to do things i just cannot do in my home gym such as the chop and lift exercises from the 4-hour body all sorts of cable exercises that would usually involve much much bigger piece of equipment”
Plugged
“This was probably 2008 or 2009 when I was working on the 4-Hour Body, and I thought, I can work with a weight vest.”
Plugged
“I recommended it way back in 2010 in The 4-Hour Body, and I did not get paid to do so.”
Passing
“and because I mean we've all seen like what the the books like the four hour work week and you know you see the young entrepreneurs on TV who've built the startup and now they're you know philanthropist or something you know you see all these stories but I don't ever really remember anyone who looks like me in those”
Plugged
“I excerpted some of those chapters in the appendix of 4-hour body”
Plugged
“in your opinion or experience, do the workouts in the 4-Hour Body still apply if on a keto diet instead of the slow carb diet that was originally in the book?”
Passing
“as evidenced by his book titles, The 4-Hour Workweek, The 4-Hour Chef, The 4-Hour Body.”
Passing
“Tim Ferris who wrote a book uh the 4our body Tim uh he didn't want to talk about it in his book because he was worried that people would start taking it like candy”
Plugged
“and I have used 99 designs for book cover ideas for the 4-Hour Body which went to number one New York Times for banner ads”
Ad read
“and I have used 99 designs for book cover ideas for the 4our body which went to number one New York Times for banner ads”
Plugged
“I've seen some pretty wild stuff with uh gene therapy in the course of doing the 4-hour body and meeting with all these athletes.”

Portraits from Wikimedia Commons: Andrew Huberman, Jamesbrianbounds / Wikimedia Commons (CC BY-SA 4.0); Tim Ferriss, Mukhatir at English Wikipedia / Wikimedia Commons (CC BY-SA 3.0); Joe Rogan, The White House / Wikimedia Commons (Public domain); Chris Williamson, CiaPeterson / Wikimedia Commons (CC BY-SA 4.0); Dave Rubin, DavidJanet88 / Wikimedia Commons (CC BY-SA 4.0); Derek Sivers, DerekSivers / Wikimedia Commons (CC BY-SA 4.0).