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Unhealthy Curiosity: Daily Summaries Delivered
by Dr Sarah Holper
Curious about why your stomach doesn’t eat itself, or why some people sweat blood? Dr Sarah Holper, physician and neurologist, explores the human body’s features, flaws, and questionable design choices. Unhealthy Curiosity uses science, history, and stories to explain why our bodies behave the way they do.
Latest Episodes
The most recent episodes — sign up to get AI-powered summaries of each one.
- Yesterday14 min
Are You Actually Asleep Right Now?
How do you know whether you’re actually asleep? People with paradoxical insomnia can spend the night convinced they’re wide awake, while their brainwaves insist otherwise. This episode explores what happens when your experience of sleep disagrees with the electrical evidence, why the sleeping brain may be more awake than we once thought, and whether you might actually be getting more sleep than you realise.
- 1 weeks ago16 min
How to Turn Your Skin Any Colour of the Rainbow
This episode explores how drugs, foods, poisons, cosmetics and assorted bodily malfunctions can produce human skin in all 7 colours of the rainbow (and how Isaac Newton is to blame for us thinking a rainbow has 7 colours in the first place).
- 3 weeks ago14 min
Why Muscles Cramp (And What to Do About It)
Dehydration. Too much water. Too much exercise. Not enough exercise. Apparently almost anything can cause a muscle cramp. This episode explores why your muscles occasionally seize without permission, what your nervous system has to do with it, and whether magnesium actually helps.
- Aug 12, 202619 min
How Does Your Tongue Know What Things Taste Like?
How can the hunk of meat in your mouth ‘know’ what the food smeared over it tastes like? This episode explores what actually makes something sweet, sour, salty, bitter or umami, and what maggot-infested cheese, antifreeze and a poisoned Roman emperor have to do with it.
- Aug 3, 202615 min
Can a Nosebleed Kill You?
Spoiler alert: yes. A nosebleed may have finished off one of history's most feared warlords. This episode explores why noses bleed so dramatically, the ingenious anatomy hidden inside your nostrils, exactly what to do the next time your nose starts gushing... and one of the strangest nosebleed case reports ever published.
- Jul 26, 202615 min
Why Your Bruises Change Colour
Your blood is always red. So why the bruise rainbow? This episode explores the colourful chemistry of bruises, from love bites and cupping to creatures with blue, green and yellow blood - and what Tiffany & Co.'s famous turquoise packaging has to do with it.
- Jul 20, 202613 min
What Does Your Belly Button Say About You?
This episode explores the history hidden inside your belly button, from Renaissance arguments over whether Adam had a navel, to the doctor who classified sixty different types of belly button, to the German students who deliberately collected facial scars to improve their marriage prospects.Classify your own belly button using Thomas Cullen's 1916 guide.
- Jul 13, 202613 min
Why Modern Marathons Are So Easy
The marathon wasn't designed by sports scientists. It was shaped by an ancient legend, a royal whim, and one spectacularly bad Olympic experiment involving purposeful dehydration, brandy, and rat poison.
About Unhealthy Curiosity
Curious about why your stomach doesn’t eat itself, or why some people sweat blood? Dr Sarah Holper, physician and neurologist, explores the human body’s features, flaws, and questionable design choices. Unhealthy Curiosity uses science, history, and stories to explain why our bodies behave the way they do.
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It's a free AI-powered email that summarizes new episodes of Unhealthy Curiosity as soon as they're published. You get the key takeaways, notable quotes, and links & mentions — all in a quick read.
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Unhealthy Curiosity covers topics including Science, Life Sciences. Our AI identifies the specific themes in each episode and highlights what matters most to you.
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