Caffeine: How Much Is Too Much?

More from Science Vs

1. 

   30 Jul 2026 · 32 min

   Free Will: Does It Exist?

   Will you hit play on this episode?? It feels like that decision is totally within your control — but what if it’s not? What if free will is just an illusion? Lots of people are using science to say that free will is a trick of the mind, that whether or not you listen to this episode, or eat a taco, or do a silly dance right now — it’s all predestined. But do we really have science receipts for that? We find out by talking to neuroscientist Prof. John-Dylan Haynes and theoretical physicist Prof. Sean Carroll. Find our transcript here: https://tinyurl.com/ScienceVsFreeWill Check out Sean…

2. 

   2 Jul 2026 · 45 min

   Narcissists: Are We Surrounded?

   The internet tells us that narcissists are everywhere — and that the problem is only getting worse. It’s like narcissism is oozing out of our celebrities, politicians, partners, parents, maybe even ourselves?? So today, we’re taking a long look in the mirror to find out: are we all a bunch of narcissists? And what should we do if we think someone in our life is a narcissist? We find out by talking to a real narcissist, Lee Hammock of the social media platform “The Self Aware Narcissist” as well as psychologists Prof. W. Keith Campbell, Prof. Kali Trzesniewski, and Dr. Craig Malkin.…

3. 

   25 Jun 2026 · 41 min

   Raw Milk: Secret Superfood??

   Raw milk is having a major moment, with fans claiming it’s a gut-healing superfood that can prevent everything from asthma to allergies. But others are like HOLD ON — we pasteurize milk to make it safe! Drinking raw milk can kill you. So, who’s right? Could there be some benefits to guzzling milk straight from the teat? Or is it a terrible idea? We talk to food science Prof. John Lucey and pediatric allergist and immunologist Prof. Christine Seroogy to find out. Find us on YouTube at ScienceVsPodcast! You can also find the show on Instagram at science_vs and Wendy on TikTok at @wendyzuk.…

4. 

   11 Jun 2026 · 43 min

   The Woman Who Felt No Fear

   A group of scientists meet a very unusual woman. A key part of her brain isn’t working: the amygdala. This is the part of the brain that we think is responsible for feeling fear. And in fact, this woman does seem pretty fearless. Researchers test her fear response using some very unconventional methods, but she takes everything in stride. Then, finally, they stumble onto the one thing that makes the woman who can’t feel fear absolutely panic. We scare up some science with neuropsychologist Dr. Justin Feinstein. Find our transcript here: https://tinyurl.com/ScienceVsWomanWhoFeltNoFear In this…

5. 

   4 Jun 2026 · 38 min

   Peptides: The Ultimate Body Hack?

   Peptides are huge right now. Influencers are telling us they can work wonders for all sorts of stuff. Struggling with an annoying injury that won't heal?? Belly fat that's pissing you off? Low energy? Gut issues?? There’s a peptide out there for you. People are buying peptides off the internet and injecting themselves with them, saying it's life changing. But away from the internet hype, there is actually a potential revolution happening in medicine around peptides. So we’re finding out what scientists are excited about here, and we look deeply at the science behind two massive peptides:…

6. 

   28 May 2026 · 41 min

   How Toxic Is the Air You Breathe?

   The Trump administration is rolling back restrictions on air pollution in the U.S., and some experts say this could affect the health of millions of people. And what makes air pollution especially dangerous is that we often can’t see it at all. So today, we’re going back to the story of Ella Kissi-Debrah, a little girl who suddenly got sick and landed in the hospital. In this episode, her mom, Rosamund, takes on the fight to find out what exactly happened to Ella. And the answer has BIG implications — for us all. We’ll hear from Rosamund Adoo-Kissi-Debrah and Professor Stephen Holgate. Find…

7. 

   8 Oct 2026 · 35 minNew

   Collagen Peptides: Should You Take Them?

   Collagen peptides!! Can they make you look younger and be healthier? It feels like everyone wants to be bursting with collagen, and apparently the way to do it is by scooping up that white powder of collagen peptides and guzzling it down. Do that, and — according to the wellfluencers — not only will your skin be as bouncy as a baby's bottom, but you'll also be stronger and you'll heal from injuries faster. But of course, not everyone is on the collagen train. There are the collagen haters, who say that eating collagen is a load of baloney. So who's right? To find out, we talk to dietetics…

8. 

   1 Oct 2026 · 59 min

   Why We Never Forget Our Teen Years, with Lisa Damour

   Our brains go completely WILD when we go through our teenage years. It’s a time where it feels like every disagreement with our parents turns into World War III, and every idea that could get us killed sounds like the most fun we could ever have. In this episode, we get into the science of what the brain is doing during the teenage years with clinical psychologist Dr. Lisa Damour. Lisa co-wrote the college textbook “Abnormal Psychology” and was a consultant on Disney's “Inside Out 2.” She takes us deep into the developing brain to explain what makes teens tick. Plus, we talk about mental…

9. 

   24 Sep 2026 · 40 min

   Stress: The Science of Chilling Out

   Stress! We’re all feeling it. And besides just feeling crappy, we’re also told that stress can wreak havoc on our bodies. The internet has a million solutions: vagus nerve stimulators, deep breaths, or a hot sauna! If that doesn’t work, maybe a cold plunge? But what does the science say about all this — what works to lower our stress? And is it really THAT bad to be stressed out? We dive into the research to find out, with psychology Professor Mark Seery, psychology Professor Jeremy Jamieson, and anatomist Dr. Theresa Larkin. Find our transcript here: https://tinyurl.com/ScienceVsStress In…

10. 

    17 Sep 2026 · 45 min

    Could AI Really Kill Us All?

    Could artificial intelligence really wipe out humanity? Claims that AI poses an existential threat are going gangbusters. AI agents from OpenAI recently hacked into another company, Hugging Face, which has people talking about whether AI can go “rogue.” And some current and former AI company employees are raising the alarm. CEOs have called for a slowdown, and one Anthropic employee just quit, saying that the companies creating this tech are putting us all at risk — and adding that “the people building AI earnestly believe that it could kill us all by the end of the decade.” So — are we…

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