Recreational Science

Why do we sweat when we get scared or anxious? It turns out, humans can smell fear in each other’s sweat. But what about horses? Can horses smell fear in human sweat?

Are sheep scared of border collies? Can you relieve their fear with Valium? There’s only one way to find out.

In this special Halloween episode, Lu and Tirth go trick-or-treating for funny and scary scientific studies. They come back with a study on blood, a study on mummies, some intriguing research on smelling fear in sweat, a couple of inquiries into sheep anxiety, and a case report of a ghostly finding on a CT scan.

Timestamps:

• 0:00 Intro
• 1:50 Blood and mummy studies
• 10:51 Fearful sweat study
• 17:33 Sheep Valium study
• 26:55 Let’s read some mail (the spooky finding on a CT scan)
• 28:23 What did you learn today, outro

Article links:

• Daniel & Egan, 1939. The Quantity of Blood Required to Produce a Tarry Stool. Journal of the American Medical Association. https://jamanetwork.com/journals/jama/article-abstract/1159185
• Critchfield & Shue, 2018. The Dead Man Test: a Preliminary Experimental Analysis. Behavior Analysis in Practice. https://link.springer.com/article/10.1007/s40617-018-0239-7
• Chen & Haviland-Jones, 2000. Human olfactory communication of emotion. Perceptual and Motor Skills. https://journals.sagepub.com/doi/10.2466/pms.2000.91.3.771?
• Jardat et al., 2026. Human emotional odours influence horses’ behaviour and physiology. PLoS One. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0337948
• Lee et al., 2016. Attention bias to threat indicates anxiety differences in sheep. Biology Letters. https://royalsocietypublishing.org/rsbl/article/12/6/20150977/50512/Attention-bias-to-threat-indicates-anxiety
• Monk et al., 2018. Attention Bias Test Differentiates Anxiety and Depression in Sheep. Frontiers in behavioral neuroscience. https://www.frontiersin.org/journals/behavioral-neuroscience/articles/10.3389/fnbeh.2018.00246/full
• Harding, 1996. The case of the haunted scrotum. Journal of the Royal Society of Medicine. https://pmc.ncbi.nlm.nih.gov/articles/PMC1295986/

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

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Theme music by Dasein:

• Spotify https://open.spotify.com/track/5fNAhYtrSM9nW9GpCiDpST?si=ea49670388f24e5c
• YouTube https://www.youtube.com/watch?v=1-WQ6G62lfM
• Apple Music https://music.apple.com/us/song/cas/1706824849

Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)

Getting kidney stones can be painful and debilitating. Exercises like walking, light cycling, and yoga can help pass kidney stones. Are there any other activities that might help too?

Driving in the middle of the night while sleep deprived is dangerous. Does drinking coffee, taking a nap, or listening to music help?

In this episode, Lu and Tirth celebrate some of the latest Ig Nobel Prize laureates, discuss whether sex is effective in passing kidney stones, and learn about the best ways to prevent drowsiness while driving late at night.

Timestamps:

• 0:00 Intro
• 1:07 Ig Nobel Prizes
• 6:17 Kidney stone study
• 19:25 Drowsy driving study
• 27:02 Let’s read some mail (the Bouba-Kiki effect)
• 30:16 What did you learn today, outro

Article links:

• Croy et al., 2017. Babies Smell Wonderful to Their Parents, Teenagers Do Not: an Exploratory Questionnaire Study on Children’s Age and Personal Odor Ratings in a Polish Sample. Chemosensory Perception. https://link.springer.com/article/10.1007/s12078-017-9230-x
• Alves-Nunes et al., 2024. RETRACTED ARTICLE: Study of defensive behavior of a venomous snake as a new approach to understand snakebite. Scientific Reports. https://www.nature.com/articles/s41598-024-59416-6
• Doluoglu et al., 2015. Can Sexual Intercourse Be an Alternative Therapy for Distal Ureteral Stones? A Prospective, Randomized, Controlled Study. Urology. https://www.goldjournal.net/article/S0090-4295(15)00347-7/fulltext
• Bayraktar & Albayrak, 2017. Sexual intercourse as a new option in the medical expulsive therapy of distal ureteral stones in males: A prospective, randomized, controlled study. International Urology and Nephrology. https://link.springer.com/article/10.1007/s11255-017-1677-9
• Abdel-Kader, 2017. Evaluation of the efficacy of sexual intercourse in expulsion of distal ureteric stones. Urology. https://link.springer.com/article/10.1007/s11255-016-1448-z
• Xu et al., 2019. Meta-analysis of the efficacy of sexual intercourse for distal ureteric stones. Journal of International Medical Research. https://journals.sagepub.com/doi/10.1177/0300060518814116
• Turgut, 2021. Evaluation of the efficacy of sexual intercourse on distal ureteral stones in women: a prospective, randomized, controlled study. International Urology and Nephrology. https://link.springer.com/article/10.1007/s11255-020-02661-1
• Philip et al., 2006. The Effects of Coffee and Napping on Nighttime Highway Driving: A Randomized Trial. Annals of Internal Medicine. https://www.acpjournals.org/doi/10.7326/0003-4819-144-11-200606060-00004
• Sheibani et al., 2022. The effect of listening to Iranian pop and classical music, on mental and physiological drowsiness. Sleep and Biological Rhythms. https://link.springer.com/article/10.1007/s41105-021-00369-y
• Loconsole et al., 2026. Matching sounds to shapes: Evidence of the bouba-kiki effect in naïve baby chicks. Science. https://www.science.org/doi/10.1126/science.adq7188

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

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Theme music by Dasein:

• Spotify https://open.spotify.com/track/5fNAhYtrSM9nW9GpCiDpST?si=ea49670388f24e5c
• YouTube https://www.youtube.com/watch?v=1-WQ6G62lfM
• Apple Music https://music.apple.com/us/song/cas/1706824849

Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)

Allergies are annoying, but maybe getting rid of them can be fun? Does a 30-minute make-out session help alleviate allergy symptoms?

What matters in a battle between two armies? Army size? The strength of individual soldiers? Or does it depend on the battlefield?

In this episode, Lu and Tirth take a quiz on classic scientific studies, investigate whether smooches ditches itches, and discuss how Age of Empires 2 and ants can be used to test out real world battlefield strategies.

Timestamps:

• 0:00 Intro
• 1:21 Classic scientific studies quiz
• 13:48 Allergy study
• 24:55 Battlefield study
• 34:54 Let’s read some mail (argumentum ad baculum)
• 38:18 What did you learn today, outro

Article links:

• Kimata, 2003. Kissing reduces allergic skin wheal responses and plasma neurotrophin levels. Physiology & Behavior. https://www.sciencedirect.com/science/article/abs/pii/S0031938403002956?via%3Dihub
• Lymbery et al., 2023. Complex battlefields favor strong soldiers over large armies in social animal warfare. Proceedings of the National Academy of Sciences. https://www.pnas.org/doi/full/10.1073/pnas.2217973120
• Wreen, 1995. Knockdown arguments. Informal Logic. https://informallogic.ca/index.php/informal_logic/article/view/2421

Studies from the quiz:

• Chau et al., 2011. Chemical processes in the deep interior of Uranus. Nature Communications. https://www.nature.com/articles/ncomms1198
• Frey et al., 2016. Four hot DOGs in the microwave. Monthly Notices of the Royal Astronomical Society. https://academic.oup.com/mnras/article/455/2/2058/1114769
• Thomson, 2007. Children crying at birthday parties. Why? Economic Theory. https://www.jstor.org/stable/27822533
• Eck, 2006. When is a bologna sandwich better than sex? A defense of small-n case study evaluations. Journal of Experimental Criminology. https://link.springer.com/article/10.1007/s11292-006-9014-9
• Paynter, 2008. Practice makes perfect: Rectal foreign bodies. Emergency Nurse. https://pubmed.ncbi.nlm.nih.gov/18372783/
• Galuzzi et al., 2025. What if my left hand wants to grab a cookie but my right one disagrees? A single case study of chronic anarchic hand syndrome rehabilitation. Neuropsychological Rehabilitation. https://www.tandfonline.com/doi/full/10.1080/09602011.2026.2620568
• Black et al., 2013. Are Children “Normal”? The Review of Economics and Statistics. https://direct.mit.edu/rest/article-abstract/95/1/21/58040/Are-Children-Normal?redirectedFrom=fulltext

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

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Theme music by Dasein:

• Spotify https://open.spotify.com/track/5fNAhYtrSM9nW9GpCiDpST?si=ea49670388f24e5c
• YouTube https://www.youtube.com/watch?v=1-WQ6G62lfM
• Apple Music https://music.apple.com/us/song/cas/1706824849

Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)

In this bonus RecSci Quick Bites episode, Lu and Tirth discuss the weight of a pound of lead and a pound of feathers, the swimming ability of fruit fly sperm after a trip to space, the force it takes to pluck nose hair, the amount of bugs that splatter on car windshields, the horsepower of a horse, the antibiotic properties of ear wax, and scrotal asymmetry in ancient sculptures.

Timestamps:

• 0:00 Intro
• 2:30 Lead vs feathers study
• 6:04 Fruit fly sperm study
• 8:02 Nose hair study
• 10:41 Bug splatter study
• 13:12 Horsepower study
• 15:19 Ear wax study
• 17:26 Scrotal asymmetry study
• 21:23 Outro

Article links:

• Wagman et al., 2007. Which feels heavier – a pound of lead or a pound of feathers? Perception. https://journals.sagepub.com/doi/abs/10.1068/p5854
• Ogneva et al., 2022. Sperm of Fruit Fly Drosophila melanogaster under Space Flight. International Journal of Molecular Science. https://www.mdpi.com/1422-0067/23/14/7498
• Prinz & Murray, 2021. On the pullout strength of human nasal hair. Materialia. https://www.sciencedirect.com/science/article/abs/pii/S2589152921001058?via%3Dihub
• Ball et al., 2021. The Bugs Matter Citizen Science Survey 2021. Kent Wildlife Trust. https://www.kentwildlifetrust.org.uk/sites/default/files/2022-05/Bugs%20Matter%202021%20National%20Report.pdf
• Stevenson & Wassersug. Horsepower from a horse. Nature. https://www.nature.com/articles/364195a0
• Tsenogu et al., 2024. Investigation of Bactericidal effect of Earwax on Escherichia coli and Staphylococcus aureus isolated from skin and stool samples of undergraduate students, Federal University of Agriculture Makurdi, Benue State, Nigeria. Journal of Surgery and Medical Case Reports. https://www.surgery-medical-casereports.com/1/article/view/6/4
• McManus, 1976. Scrotal asymmetry in man and in ancient sculpture. Nature. https://www.nature.com/articles/259426b0
• McManus & Humphrey, 1973. Turning the Left Cheek. Nature. https://www.nature.com/articles/243271a0

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

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Theme music by Dasein:

• Spotify https://open.spotify.com/track/5fNAhYtrSM9nW9GpCiDpST?si=ea49670388f24e5c
• YouTube https://www.youtube.com/watch?v=1-WQ6G62lfM
• Apple Music https://music.apple.com/us/song/cas/1706824849

Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)

Why do some people enjoy looking at beautiful art? Why do some people enjoy looking at ugly art? Could it have something to do with how much they enjoy pain?

Are goldfish as dumb as we think they are? Can they learn to drive cars to forage for food?

In this episode, Lu and Tirth discuss the effects of looking at paintings on physical pain tolerance and how goldfish are perhaps as smart as a 16-year-old human.

Timestamps:

• 0:00 Intro
• 1:33 Tirth’s interesting wedding
• 8:09 Pain study
• 19:29 Goldfish study
• 29:48 Let’s read some mail (toilet flushing)
• 32:58 What did you learn today, outro

Article links:

• de Tommaso et al., 2008. Aesthetic value of paintings affects pain thresholds. Consciousness and Cognition. https://www.sciencedirect.com/science/article/abs/pii/S1053810008001177
• Giveon et al., 2022. From fish out of water to new insights on navigation mechanisms in animals. Behavioural Brain Research. https://doi.org/10.1016/j.bbr.2021.113711
• Goforth et al., 2024. Impacts of lid closure during toilet flushing and of toilet bowl cleaning on viral contamination of surfaces in United States restrooms. American Journal of Infection Control. https://www.ajicjournal.org/article/S0196-6553%2823%2900820-9/fulltext

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

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Theme music by Dasein:

• Spotify https://open.spotify.com/track/5fNAhYtrSM9nW9GpCiDpST?si=ea49670388f24e5c
• YouTube https://www.youtube.com/watch?v=1-WQ6G62lfM
• Apple Music https://music.apple.com/us/song/cas/1706824849

Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)

Urinal etiquette is sacred. Why do men always leave an empty urinal as buffer space when peeing in a public restroom? Could it have an effect on how well they pee?

Why do people enjoy hiking in the woods so much? Can you get the same enjoyment from touching a piece of wood?

In this episode, Lu and Tirth discuss the physiologic reason behind men’s well-established urinal etiquette and how touching wood affects your brain and heart activity.

Timestamps:

• 0:00 Intro
• 0:26 Tirth’s upcoming wedding plans
• 3:17 Urinal study
• 18:14 Touching wood study
• 28:44 Let’s read some mail (bird talk)
• 31:05 What did you learn today, outro

Article links:

• Middlemist et al., 1976. Personal space invasions in the lavatory: suggestive evidence for arousal. Journal of Personality and Social Psychology. https://psycnet.apa.org/doiLanding?doi=10.1037%2F0022-3514.33.5.541
• Ikei et al., 2017. Physiological Effects of Touching Wood. International Journal of Environmental Research and Public Health. https://pmc.ncbi.nlm.nih.gov/articles/PMC5551239/
• Zongker, 2006. Chicken chicken chicken chicken chicken. Annals of Improbable Research. https://improbable.com/airchives/paperair/volume12/v12i5/chicken-12-5.pdf

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

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Theme music by Dasein:

• Spotify https://open.spotify.com/track/5fNAhYtrSM9nW9GpCiDpST?si=ea49670388f24e5c
• YouTube https://www.youtube.com/watch?v=1-WQ6G62lfM
• Apple Music https://music.apple.com/us/song/cas/1706824849

Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)

When there are images of eyes around, people are less likely to steal and more likely to donate money. What about images of other body parts? Moreover, do images of eyes make dogs less likely to steal as well?

What measurement on the body is correlated with success at your job and athletic prowess in sports?

In this episode, Lu and Tirth take an obscure anatomy terminology quiz, discuss how images of eyes, mouths, and noses affect pro- and antisocial behavior in people and in dogs, and dissect whether the size of a part of your body may predict success in life.

Check out paint.brains on Instagram! https://www.instagram.com/paint.brains/

Timestamps:

• 0:00 Intro
• 0:55 Anatomy quiz
• 12:51 Watching eye studies
• 24:19 Success prediction studies
• 34:32 Let’s read some mail
• 36:03 What did you learn today, outro

Article links:

• Kelsey et al., 2018. Eyes, More Than Other Facial Features, Enhance Real-World Donation Behavior. Human Nature. https://link.springer.com/article/10.1007/s12110-018-9327-1
• Neilands et al., 2020. Watching eyes do not stop dogs stealing food: evidence against a general risk-aversion hypothesis for the watching-eye effect. Scientific Reports. https://www.nature.com/articles/s41598-020-58210-4
• Coates et al., 2009. Second-to-fourth digit ratio predicts success among high-frequency financial traders. Proceedings of the National Academy of Sciences. https://www.pnas.org/doi/epdf/10.1073/pnas.0810907106
• Manning et al., 2001. Second to fourth digit ratio and male ability in sport: implications for sexual selection in humans. Evolution and Human Behavior. https://doi.org/10.1016/s1090-5138(00)00063-5
• Nye et al., 2017. The effects of prenatal testosterone on wages: Evidence from Russia. Economics and Human Biology. https://doi.org/10.1016/j.ehb.2016.11.003
• Hayashi & Sakamoto, 2025. Sexual activity is predicted by digit ratio in rats. Experimental Animals. https://www.jstage.jst.go.jp/article/expanim/74/4/74_24-0159/_article

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

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Theme music by Dasein:

• Spotify https://open.spotify.com/track/5fNAhYtrSM9nW9GpCiDpST?si=ea49670388f24e5c
• YouTube https://www.youtube.com/watch?v=1-WQ6G62lfM
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Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)

What’s the best way to get rid of hiccups? Have you tried massaging your butt?

Animals are deeply in tune with nature. Are insects more or less likely to mate when a storm is approaching?

In this episode, Lu and Tirth discuss the effectiveness of digital rectal massage in treating otherwise incurable hiccups and how moths’ and beetles’ interest in sex changes depending on the atmospheric pressure.

Timestamps:

• 0:00 Intro
• 0:41 Texas
• 7:21 Hiccups studies
• 19:03 Insect study
• 27:25 Let’s read some mail
• 31:34 What did you learn today, outro

Article links:

• Fesmire, 1988. Termination of intractable hiccups with digital rectal massage. Annals of Emergency Medicine. https://www.annemergmed.com/article/S0196-0644(88)80594-8/abstract
• Odeh et al., 1990. Termination of intractable hiccups with digital rectal massage. Journal of Internal Medicine. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2796.1990.tb00134.x
• Lee & Tong, 2017. Termination of Persistent Hiccups by Digital Rectal Massage. The Journal of Emergency Medicine. https://www.jem-journal.com/article/S0736-4679(16)30634-5/abstract
• Pellegrino et al., 2013. Weather Forecasting by Insects: Modified Sexual Behaviour in Response to Atmospheric Pressure Changes. PLoS One. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0075004

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

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Theme music by Dasein:

• Spotify https://open.spotify.com/track/5fNAhYtrSM9nW9GpCiDpST?si=ea49670388f24e5c
• YouTube https://www.youtube.com/watch?v=1-WQ6G62lfM
• Apple Music https://music.apple.com/us/song/cas/1706824849

Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)

In this bonus RecSci Quick Bites episode, Lu and Tirth discuss monkeys’ choice for dental floss, how your ears get bigger as you age, whether moms can identify their baby’s soiled diapers, analyzing poop in log form, boxers versus briefs, and how to settle co-first authorship between friends.

Timestamps:

• 0:00 Intro
• 1:17 Monkey study
• 3:33 Big ears study
• 6:03 Diaper study
• 8:33 Poop analysis study
• 11:04 Underwear study
• 13:58 Co-first authorship
• 15:50 Outro

Article links:

• Watanabe et al., 2007. Long-tailed macaques use human hair as dental floss. American Journal of Primatology. https://onlinelibrary.wiley.com/doi/10.1002/ajp.20403
• Heathcote, 1995. Why do old men have big ears? British Medical Journal. https://www.bmj.com/content/311/7021/1668.short
• Case et al., 2006. My baby doesn't smell as bad as yours: The plasticity of disgust. Evolution and Human Behavior. https://www.sciencedirect.com/science/article/abs/pii/S1090513806000195
• Krauth et al., 2012. An In-Depth Analysis of a Piece of Shit: Distribution of Schistosoma mansoni and Hookworm Eggs in Human Stool. PLoS Neglected Tropical Diseases. https://journals.plos.org/plosntds/article?id=10.1371/journal.pntd.0001969
• Minguez-Alarcon et al., 2018. Type of underwear worn and markers of testicular function among men attending a fertility center. Human Reproduction. https://academic.oup.com/humrep/article/33/9/1749/5066758
• Bai & Zhu et al., 2021. Adjacent Cell Marker Lateral Spillover Compensation and Reinforcement for Multiplexed Images. Frontiers in Immunology. https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2021.652631/full

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

Follow us on social media @RecSciPod!

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Theme music by Dasein:

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Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)

Does the sex of the bird affect how soon they fly away when approached by humans? What about the sex of the human?

Coming across a steep hill while out jogging can be intimidating. Does being tired affect how runners perceive the size of hills?

In this episode, Lu and Tirth discuss how European birds are sexist towards humans and how just tricking people into believing they have to climb a hill can cause them to exaggerate its steepness.

Timestamps:

• 0:00 Intro
• 0:48 Ways to improve the podcast
• 7:25 Bird study
• 17:08 Hill study
• 26:44 Let’s read some mail
• 29:23 What did you learn today, outro

Article links:

• Morelli et al., 2025. Sex matters: European urban birds flee approaching women sooner than approaching men. People and Nature. https://besjournals.onlinelibrary.wiley.com/doi/10.1002/pan3.70226
• Bhalla et al., 1999. Visual-Motor Recalibration in Geographical Slant Perception. Journal of Experimental Psychology: Human Perception and Performance. https://psycnet.apa.org/record/1999-03275-014

You can find Recreational Science (#RecSciPod) everywhere great podcasts are found!

Follow us on social media @RecSciPod!

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Theme music by Dasein:

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• YouTube https://www.youtube.com/watch?v=1-WQ6G62lfM
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Recreational Science is produced by Scientafic (https://www.scientafic.com/recscipod)