Judy Grisel is a professor of psychology and neuroscience at Bucknell University and the author of Never Enough: The Neuroscience and Experience of Addiction.

What actually drives addiction — genes or environment? Judy spent a decade lost to addiction, homeless and sick, before turning her own life into a research question and becoming one of the field's leading addiction neuroscientists. Her answer is close to fifty-fifty. So what tips the balance, and why do addiction rates keep climbing even though our genes haven't changed?

Expect to learn why cannabis may be more addictive than heroin, what's actually happening in the brain's dopamine pathway when we crave something, why the anticipation of a reward feels better than the reward itself, why 90% of people who develop an addiction start using before they turn 18, how boredom is a bigger risk factor than poverty, how Judy went from homeless and addicted to a tenured neuroscientist, why "resetting your dopamine" isn't as simple as people claim online and much more…

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0:00 Fifty-Fifty Split

2:55 Inside the Brain's Dopamine Pathway

5:10 Can You Actually Reset Your Dopamine

10:53 The Genetics of Addiction Risk

14:50 What to Do if You're Wired for It

17:20 Why Boredom Beats Poverty as a Risk Factor

20:41 Do We Really Have More Free Time Than Our Ancestors

25:13 Cannabis Is More Addictive Than Heroin

28:49 Judy's Own Decade Lost to Addiction

33:41 Why Her Recovery Actually Stuck

39:59 The Carl Hart Debate on Using Safely

46:00 Chase's Own Cold Turkey Moment

50:32 Closing Questions and Book Recs

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This is a solo episode — I talk through the fears I don't usually say out loud.

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Nick Pelletier is an ultra endurance athlete, documentary filmmaker, and host of the Comfort Breeds Complacency podcast.

What does it take to fail at something twice and still go back? Nick spent four years and three attempts trying to swim the 113-kilometer length of Okanagan Lake, battling chafing so severe he couldn't lift his arms, wildfire smoke that erased the shoreline, and a shoulder that gave out mid-swim. So what finally got him across, and what happens when Mother Nature says no anyway?

Expect to learn why Nick's first attempt at swimming Okanagan Lake ended in agonizing chafing after eight hours, how wildfire smoke wiped out his ability to sight the shoreline and ended his second attempt, what it felt like when his shoulder gave out from thousands of strokes, why his dad was the one who had to call off two failed attempts, what it's like to get stung by a Portuguese man o' war mid-ocean-swim and lose the use of your legs, why a hot shower turned out to be the real cure for the sting, and how three failures over four years turned into a 71-hour finish and much more…

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0:00 Intro & The Sink Or Swim Documentary

1:27 The 113-Kilometer Swim Across Okanagan Lake

3:52 His First Long Swim Attempt With Almost No Experience

8:24 Attempt One: Chafing So Bad He Couldn't Lift His Arms

12:12 Rating The Failures: Swimming Vs. Cycling And Running

16:34 Stung By A Portuguese Man O'War Mid-Swim

21:52 Attempt Two: Wildfire Smoke And A Shoulder That Gave Out

25:37 Solo Cycling Through Mexico's Cartel Zones

33:45 Preparing For The Third Attempt

35:49 His Dad Backs Him When The Crew Wants To Pull Him

41:43 Finishing After 71 Hours In The Water

45:35 Why He Keeps Choosing Voluntary Suffering

54:21 What's Next: The Bigfoot 200

55:55 Closing Questions: Who To Talk To Next And Book Recs

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Ryan Glatt is a brain health coach, certified personal trainer, and director of the FitBrain Program at the Pacific Neuroscience Institute, and author of Brain Health and Exercise.

What's actually happening in your brain when you exercise? Most of what circulates online about neuroplasticity, brain rewiring, and "brain hacks" is either oversimplified or flat-out wrong, and there's no shortage of influencers cashing in on the confusion. So what does the research actually show about exercise and the brain, and how do you build a routine that works with it instead of guessing?

Expect to learn what exergaming actually is and how a Nintendo Wii could help rehab a stroke patient, why neuroplasticity is an ability and not a resource you can buy in a bottle, the myth behind "neurons that wire together, fire together," the three levels at which exercise changes your brain (micro, macro, and behavioral), why he calls exercise a "neuropolypill," how to program aerobic, resistance, and neuromotor training across your week, and why doing the thing you're worst at might be the best thing for your brain and much more…

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0:00 What Is Exergaming, Really?

5:58 Why Games Get People Moving When Willpower Won't

11:05 Inside The New Book: Brain Health And Exercise

18:39 The Neuroplasticity Myth Everyone's Selling

20:27 The "Neurons That Fire Together, Wire Together" Myth, Debunked

25:03 The Three Levels Of How Exercise Changes Your Brain

32:37 Why He Calls Exercise A "Neuropolypill"

37:35 Programming Your Week: How Much Of Each Exercise Type

43:32 The Third Exercise Category Almost Nobody Programs

47:10 Can Exercise Offset A Bad Night Of Sleep?

49:32 Calling Out Neuroscience Influencers

50:42 The Dual-Tasking Trick For A Sharper Brain

54:26 Where To Find Ryan And His Book

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Mark Divine is a retired U.S. Navy SEAL Commander, founder of SEALFIT and Unbeatable Mind, and author of several bestselling books including Unbeatable Mind and The Way of the SEAL.

What's actually happening when a mind can't be broken? Mark earned the nickname "Cyborg" in the SEALs for barely registering pain, but what he's built since retiring goes far beyond physical toughness into a rigorous daily practice of training the mind itself. So what does it actually take to stop reacting to your own thoughts, and is willpower even the right word for it?

Expect to learn where Mark's nickname "Cyborg" actually came from, how childhood conditioning and years of Zen practice combined to change his relationship with pain, why box breathing became the technique he introduced to the SEALs in 2006, what "catching the snake at the head" means and why it's the key to breaking reactive patterns, how meditation training compounds like physical training but shows no visible reps, why almost none of your opinions are actually your own, and much more…

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0:00 Where The Nickname Cyborg Came From

2:02 Zen Training And Childhood Abuse Behind His Pain Tolerance

5:47 Parenting An Adopted Son Without Forcing Your Own Path

10:50 Chase On Pain-Driven Ambition Vs His Sister's Joy

12:35 The Twins Story Same Father Opposite Lives

15:44 The Ego Is Just A Bunch Of Habits

20:29 When The Zen Practice Actually Took Hold

22:44 Box Breathing The Secret Weapon He Gave The SEALs In 2006

31:06 The Four Phases Of Awakening

33:29 Why Meditation's Benefits Stay Invisible Until They Don't

37:22 Mental Training As The Parallel To Physical Training

41:47 Why You Probably Don't Have A Single Original Opinion

43:31 The Educational System Is Indoctrination And Reality Is Subjective

48:33 Everyone You Meet Is Trapped In Their Own Simulation

51:30 The 90-Day Challenge Closing Questions And Book Recs

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Dr. Dan Sullivan is a naturopathic doctor, functional medicine practitioner, and ADHD specialist.

What's actually driving the rise in adult ADHD diagnoses? Standard of care jumps straight to stimulant medication, but Dr. Dan Sullivan argues that medicating a body that's never been tested is like bolting a turbocharger onto an engine that was never built to handle it. So what should actually come before the prescription, and why does "normal" bloodwork rarely mean optimal?

Expect to learn why ADHD medication works like a turbocharger on an unprepared engine, why stimulants can make ADHD worse when nutrient deficiencies go unaddressed, why ADHD comes with a genetically delayed circadian rhythm that makes falling asleep harder, what "normal" lab ranges actually hide, why protein and tyrosine in the morning matter more than people think, how to train HRV instead of just tracking it, and much more…

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0:00 Intro

2:01 The Three Types Of ADHD

4:28 Race Car Engine, Bicycle Brakes: How Stimulants Work

7:28 The Natural Alternatives To Medication

10:30 Nature Vs Nurture In ADHD

13:42 The Turbocharger Problem With Medicating Too Soon

20:23 ADHD's Built-In Sleep Delay

25:00 Why Consistency Beats Any Supplement

33:46 Dan's Morning Routine And Biofeedback Training

40:20 Eating For Micronutrient Gaps

51:33 Sauna, Cold Plunge, And HRV Training

59:31 The Blood Tests Nobody Runs

1:04:55 Closing Questions: Book & Guest Recs

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Bradley Schurman is a demographer, futurist, and the author of The Super Age: Decoding Our Demographic Destiny.

What happens when a country runs out of people before it runs out of promises to them? By the end of the decade, America will have more people over 65 than under 18, and the Social Security and Medicare trust funds are on pace to run dry by 2030 with no fix in sight. So how much of that shortfall lands on the generation that didn't create it, and what happens to the cities, jobs, and social contract left behind

Expect to learn why Bradley ranked 250 American cities on their long-term resilience and what it revealed about where people should actually move, why China overbuilt its housing by 65 million units (the entire population of France), why Social Security and Medicare are on track to run out of money by 2030 with zero serious plans to fix it, why demographic decline is quietly rewriting the future of war in Ukraine and beyond, why an aging population might be a parachute rather than a burden, why multi-generational households are quietly making a comeback, and much more…

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0:00 Intro: The Geography Of Prosperity Project

1:57 Why We're Ranking 250 American Cities

6:47 The Genesis Of The Index

9:28 When You Don't Get To Choose Where You Live

13:49 The Five Dimensions Of A Resilient City

18:11 The Loneliness Epidemic And Weak Ties

20:28 From Demographic Destiny To City Rankings

28:47 Social Security Runs Out By 2030

32:18 China Overbuilt Housing By 65 Million Units

34:13 Why A Robot Can't Buy A Coke4

0:33 The Grand Renegotiation Coming For Social Security

46:49 How Messy Will The Pinch Point Be

53:40 What Young People Should Actually Do

1:06:01 How Population Decline Is Rewriting War

1:12:15 Closing Questions: Next Guest & Book Recs

David Allen is the creator of the Getting Things Done (GTD) methodology, a management consultant, and an executive coach.

What's actually stealing your focus? Most people are carrying somewhere between 150 and 200 unfinished commitments in their head at once, using their brain as an office it was never built to be. So why does everyone feel so overwhelmed, and what does it actually take to get a clear head back?

Expect to learn why your brain is a terrible place to store your to-do list, the five-step method David Allen uses to get anything off his mind for good, why no thought should ever have to occur to you twice, what "ambient anxiety" is and why so many high achievers are addicted to it, the six levels of focus that run from tonight's grocery list all the way up to your life's purpose, why David didn't publish Getting Things Done until he was fifty-five, what "mind like water" actually means and why Bruce Lee's sensei coined it and much more…

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0:00 Intro

1:29 The Five Steps To A Clear Head

2:32 The Cognitive Science Of Mental Overload

3:34 How He Discovered The GTD Method

4:46 Channel Creep Is Why Everyone Feels Overwhelmed

9:21 What Does Done Actually Mean

11:25 His Low-Tech Capture Tool: Pen And Paper

13:13 You're Addicted To Ambient Anxiety

20:22 Appropriate Engagement With Everything In Your Life

25:32 The Six Levels Of Priority

30:44 35 Jobs Before 35

34:48 What Mind Like Water Actually Means

41:14 Closing Questions: Talk To Yourself First

Simone Stolzoff is a journalist, author, and TED speaker.

What happens when the world gets more uncertain right as our tolerance for uncertainty keeps shrinking? Answers are a tap away, yet most people are more anxious and less equipped to sit with not knowing than ever before. So what's actually driving that gap, and how do you build the tolerance back?

Expect to learn why our brains are biologically wired to treat uncertainty as a threat, the real story behind why Slack almost never existed, the difference between acute uncertainty and the ambient uncertainty we're all swimming in right now, why bracing for the worst might actually be a self-protective habit rather than a flaw, the two-by-two matrix for knowing where to actually spend your worry, why one-way door decisions and two-way door decisions require completely different thinking, how to build real trust in your future self's ability to handle whatever comes and much more…

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0:00 Why Your Brain Treats Uncertainty As A Threat

3:37 The Founder Who Killed His Own Hit Game To Build Slack

7:36 Acute Vs. Ambient Uncertainty

8:54 The Two Faces Of Low Tolerance: Hoarding Info Or Winging It

10:09 Building Your Uncertainty Tolerance Like A Muscle

14:29 The Two-By-Two Matrix For Where To Spend Your Worry

15:19 Why Bracing For The Worst Might Be Self-Protective

18:58 The World Is Getting More Uncertain, Faster

20:50 The Job Offer That Wouldn't Let Simone Sleep

26:19 Diversifying Your Identity Beyond Your Job

32:02 Loneliness And The Shrinking Self

35:57 The Explore-Exploit Trade-Off

39:59 One-Way Doors Vs. Two-Way Doors

46:57 Closing Questions

Dr. Paul Morland is a demographer, author, and researcher.

What's actually happening to the global population? For decades we were warned about overpopulation, yet birth rates are now collapsing below replacement across most of the world, from China to Chile. So what happens to an economy, and a civilization, when there simply aren't enough people left to sustain it?

Expect to learn why the overpopulation you were taught about is already reversing, how a fertility rate of 0.75 turns 100 grandparents into just 16 grandchildren, why China's population is set to halve by the end of the century, what the "silver tsunami" will do to taxes and pensions, why Paul doesn't blame microplastics or sperm counts for the birth crisis, whether AI and robots can actually replace a shrinking workforce, why no time will ever feel perfect to start a family and much more…

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0:00 From Overpopulation To Collapse

3:51 Why The Reversal Is Slow To Sink In

6:26 The Silver Tsunami Explained

9:47 Fertility Rate vs Replacement Rate

17:46 Where Fertility Rates Stand Now

22:07 How 100 Grandparents Become 16

23:38 Demographics, War And Power

28:18 Is Biology To Blame?

32:13 The Real Causes: Culture And Economics

38:39 Will AI And Robots Save Us?

44:21 Why Fewer People Won't Save The Planet

53:06 Japan, Britain And The US In 25 Years

1:00:44 Why No Time Is Ever Perfect

1:03:04 Closing Questions And Book Recs

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