The Rest Is Science
Join mathematician Professor Hannah Fry and science creator Michael Stevens (Vsauce) as they dig into the weird scientific questions that often go unexplored. Welcome to The Rest Is Science, a show that sits in the fascinating space between what we think we know, and what we actually know. Why do we assume we understand things like time, randomness, or even gravity? Once you start questioning these familiar ideas, reality becomes astonishingly strange and completely fragile. Whether you're a lifelong science fan or just naturally curious, The Rest Is Science will change your perception of reality, and prove that the biggest questions are always the most fun.
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Recent Episodes
Do You Own Your Own Foot?
May 24, 2026Summary Preview
Hannah Fry and Michael Stevens explore the fascinating legal and ethical questions surrounding body part ownership, from amputated limbs to baby teeth. They examine what happens to body parts after amputation, death, and throughout history, revealing surprising laws about cremation restrictions, the body snatching trade, and famous cases like Einstein's stolen brain. The discussion ranges from eating your own flesh to creating drinking goblets from skulls, while uncovering the fundamental legal principle that corpses cannot be property.
- Baby Teeth, Body Parts, and Family Keepsakes
- What Happens to Amputated Limbs: The Legal Framework
Hannah Predicted a Pandemic
May 20, 2026Summary Preview
In this Field Notes episode, Michael Stevens and Hannah Fry tackle listener questions about consciousness, quantum spin, and atomic density before Hannah shares an extraordinary story about accidentally predicting the COVID-19 pandemic in a 2018 BBC documentary. The discussion explores the hard problem of consciousness, the counterintuitive nature of quantum mechanics, and Hannah's reflections on vaccine hesitancy and institutional trust during the pandemic.
- The Nature of Self and Consciousness
- Quantum Spin Explained
DARK vs LIGHT
May 17, 2026Summary Preview
Hannah Fry and Michael Stephens tackle a delightful question from a seven-year-old listener about which would win in a fight between black and white. The hosts explore this question through multiple lenses—from color preferences and fashion to physics, chess, literature, and philosophy—ultimately concluding that both black and white are necessary and powerful in their own ways, and that the real winner is 'not gray.'
- Color Popularity and Fashion Dominance
- Aggression, Sports, and the Psychology of Black
Polymetalic Nodules Are Weird
May 13, 2026Summary Preview
Hannah Fry and Michael Stevens explore fascinating scientific topics including polymetallic nodules from the ocean floor, the mysteries of handedness and ambidexterity, lightning strikes on tall animals, and how humidity affects temperature perception. The episode features their signature blend of rigorous science and playful banter, culminating in an unexpected discussion about sexy accents.
- Polymetallic Nodules: Ancient Ocean Treasures
- The Science of Handedness and Ambidexterity
"A Grim Enemy For Reasons We Do Not Yet Comprehend"
May 11, 2026Summary Preview
This episode explores the paradoxical legacy of Fritz Haber, a German chemist whose scientific breakthrough both saved billions of lives and enabled mass death. Hosts Hannah Fry and Michael Stevens examine how Haber's process for splitting nitrogen molecules revolutionized agriculture through synthetic fertilizer while simultaneously providing the technology for chemical weapons and explosives that prolonged World War I and contributed to millions of deaths.
- The Nitrogen Crisis and Historical Fertilizer Desperation
- Fritz Haber's Revolutionary Nitrogen-Splitting Process
When 0 = 1000
May 06, 2026Summary Preview
Michael and Hannah explore the fascinating world of calorie measurement and food labeling regulations, revealing how marketing claims like 'zero calories' can technically contain 1,000 calories due to regulatory rounding rules. They dive into the quirks of nutrition science, the history of calorie calculation, and answer listener questions about where burned calories actually go, NASA technologies in everyday life, and the unexplored territory of dual sensory deprivation experiments.
- The Zero Calorie Paradox: US vs UK Labeling
- The Science Behind Calorie Measurement
How To Use a Black Hole To See Your Past
May 04, 2026Summary Preview
Michael Stevens and Hannah Fry explore how we could theoretically observe Earth's past by using celestial objects as telescopes. They discuss using black holes as mirrors, the sun's gravitational lensing, and Earth's atmosphere as natural telescopes to view historical events, examining the physics, engineering challenges, and incredible possibilities of looking backward in time through space.
- Looking Into Our Past Through Space
- Black Holes as Cosmic Mirrors
The Barf Bag Episode
Apr 29, 2026Summary Preview
Hannah Fry and Michael Stevens explore the quirky world of airline sick bags, with Michael revealing his personal collection of barf bags from various airlines. The episode combines the peculiar hobby of 'baggism' with fascinating insights into aircraft technology, motion sickness, cabin pressure, and the science behind turbulence. The discussion also tackles listener questions about Earth flags, AI consciousness, and the effects of Earth's rotation on the human body.
- The World of Barf Bag Collecting
- The History and Science of Motion Sickness on Aircraft
The Chemical Basis of Morphogenesis
Apr 27, 2026Summary Preview
Hannah Fry and Michael Stevens explore Alan Turing's groundbreaking 1952 work on reaction-diffusion systems, which explains how biological patterns emerge from chaos. Starting with the fundamental question of how embryos develop structure, they trace Turing's mathematical insights through leopard spots, zebra stripes, human fingerprints, and even urban crime prediction, ultimately confronting the profound ethical implications of applying mathematical models to human systems.
- The Fundamental Mystery of Biological Structure
- Alan Turing's Revolutionary Insight
How To Prove You're A Time Traveller
Apr 22, 2026Processing failed
The Reasoning Test Psychologists Still Can't Explain
Apr 20, 2026Summary Preview
Michael Stevens and Hannah Fry explore the famous Wason Selection Task, a reasoning puzzle that 96% of people fail, despite it being logically simple. Through various formulations of the same logical problem, they reveal how human reasoning evolved for social cooperation rather than abstract truth-finding. The discussion covers confirmation bias, the difficulty of seeking counterexamples, and why we're better at solving problems involving social rules than mathematical abstractions.
- The Wason Selection Task: A Puzzle Almost Everyone Gets Wrong
- The Bar Version: When Everyone Gets It Right
The Elegant Laminar Flow Of Moroccan Tea
Apr 15, 2026Summary Preview
Hannah and Michael explore the fascinating physics behind Moroccan teapots, demonstrating how traditional design perfectly embodies fluid dynamics principles without any mathematical equations. They then tackle listener questions about altitude, boiling points, sea levels, and how much of Earth humans have actually touched, before diving into the sensory mysteries of how we perceive texture through clothing.
- The Physics of Moroccan Tea and Teapot Design
- Altitude, Boiling Points, and Rising Sea Levels
Science Is (Literally) Cool
Apr 13, 2026Summary Preview
Michael Stevens and Hannah Fry explore the fascinating science behind everyday kitchen appliances, revealing how refrigerators, microwaves, and other common devices employ sophisticated physics and have surprising historical origins. From the Ice King of Massachusetts to U-boat detection during WWII, the episode traces how military technology and scientific accidents transformed our kitchens into high-performance laboratories.
- The Ice King and the Birth of Cold Commerce
- Making Ice Without Refrigeration
Summary Preview
In this Field Notes episode, Michael Stevens and Hannah Fry explore listener questions ranging from historical technological heists to the surprising mathematics of construction workers' eye colors. The discussion spans from Byzantine silk smuggling to industrial espionage that shaped American slavery, before diving into quirky calculations comparing cloud data to raindrops and analyzing whether blue-eyed construction workers represent a statistical anomaly. Michael also showcases creative periodic table alternatives and unusual items from the latest Curiosity Box, including a periodic snail pin and a recipe shirt for processing uranium ore.
- Historical Technological Heists: Silk and Spinning Machines
- Cloud Data vs. Raindrops: A Quantitative Comparison
This Toothpick Contains Everything Ever Said
Apr 06, 2026Summary Preview
In this mind-bending exploration of infinity, Hannah Fry and Michael Stevens venture beyond the counting numbers to examine increasingly massive infinities, from power sets to inaccessible cardinals. They grapple with profound questions about whether infinity truly exists in our universe or remains purely mathematical, examining evidence from cosmology and quantum physics while confronting deeply uncomfortable implications about reality, parallel universes, and the fundamental nature of space itself.
- Everything on a Toothpick: Infinite Precision
- Beyond Aleph Null: The Hierarchy of Infinities
Why We Need Zip Lines On The Moon
Apr 01, 2026Summary Preview
Michael and Hannah tackle listener questions ranging from building a zipline from the moon to Earth, the psychology of numbers, giving blood, and mechanical calculators. The discussion reveals how practical engineering challenges intersect with human perception and mathematics, featuring detailed explorations of space elevators, synesthesia, caloric expenditure, and pre-digital computing devices.
- Lunar Zipline Business Proposal
- Numbers Have Personalities: Synesthesia and Mathematical Character
Two Infinities (And Beyond)
Mar 30, 2026Summary Preview
Hannah Fry and Michael Stevens explore the mind-bending concept of infinity, tracing its philosophical and mathematical journey from ancient Greek discomfort with the concept to Georg Cantor's revolutionary proof that some infinities are bigger than others. They examine how thinkers throughout history wrestled with whether infinity actually exists, leading to Cantor's groundbreaking diagonal argument that demonstrated the real numbers form a larger infinity than the natural numbers—a discovery that cost him dearly both professionally and personally.
- The Historical Struggle with Infinity
- Challenging Aristotle: Early Mathematical Insights
How Evolution Is Shaping Cancer Research
Mar 26, 2026Summary Preview
This special episode explores the evolutionary nature of cancer, examining how tumors grow, adapt, and respond to treatment through the lens of evolutionary biology. Hosted in partnership with Cancer Research UK, Hannah Fry and Michael Stevens discuss cutting-edge research including early detection methods, cancer vaccines, immunotherapies, and innovative treatment strategies that harness the body's own systems to fight cancer.
- Cancer as Evolutionary Biology: Understanding Tumor Ecosystems
- TracerX Study and the Quest for Truncal Mutations
Paradoxes Of Infinity
Mar 24, 2026Summary Preview
Hannah Fry and Michael Stevens explore the fascinating and paradoxical nature of infinity, examining ancient Greek paradoxes, the development of calculus, and the strange behavior of infinite quantities. They discuss Hilbert's Hotel, Zeno's paradoxes, the bitter rivalry between Newton and Leibniz over calculus, and various mathematical puzzles that reveal how infinity defies our intuition about numbers.
- The Paradox of Wanting to Live Forever
- Defining Infinity and Its Strange Properties
Michael's Favourite Science Books
Mar 19, 2026Summary Preview
Michael Stevens and Hannah Fry discuss field notes and discoveries, with Michael revealing his favorite science books and reading recommendations. The episode covers a wide range of topics including lasers and cats, fluid dynamics for removing dog fur from cars, and childhood development experiments. The second half features an extensive book recommendation segment where Michael shares his carefully curated list of science, physics, mathematics, and philosophy books that have influenced his work on Vsauce.
- Lasers and Cats: A 21-Year Journey
- Fluid Dynamics: Removing Dog Fur from Cars