Talking Science

You are not, strictly speaking, a single organism — you're a walking ecosystem, home to trillions of bacteria that outnumber your own cells and carry hundreds of times more genes than your own genome. We explore what this “microbiome” does for digestion, immunity and even mood, how it gets established, and why the science here is exciting, fast-moving, and easy to overhype.

You'll come away understanding where these microbes live and what they do, how antibiotics and diet reshape them, what the gut-brain link really amounts to, and how to tell a solid finding from a marketing claim.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: the Human Microbiome Project (NIH); Nature microbiome collection; CSIRO gut health resources.

Saturn's rings are the most beautiful sight in the solar system and also a bit of a scandal — they may be far younger than the planet, and they're disappearing. We look at what the rings are actually made of, why they form flat sheets instead of clumping into a moon, the surprising debate about their age, and the slow “ring rain” that will eventually erase them.

You'll come away understanding why the rings are so thin, what the gaps in them mean, why we might be lucky to be alive while they exist, and how a spacecraft's final dive settled some very old questions.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: NASA Cassini mission science pages; “Saturn's Rings” overview at the Planetary Society; NASA JPL Grand Finale results.

Set aside the politics for a moment: at its core, climate change is a physics problem, and the physics has been understood since before the light bulb. We walk through the greenhouse effect from first principles, follow the chain of evidence that links burning fossil fuels to a warming planet, and explain how scientists can say with confidence that recent warming is caused by us.

You'll come away understanding why certain gases trap heat, how we know carbon dioxide is rising and where it's coming from, what “attribution” means, and why a couple of degrees of average warming is a much bigger deal than it sounds.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: IPCC Sixth Assessment Report, Summary for Policymakers; NASA Global Climate Change (climate.nasa.gov); CSIRO and Bureau of Meteorology “State of the Climate” reports.

Light is the most familiar thing in the world and one of the strangest. For two centuries physicists argued about whether it was a wave or a stream of particles, ran clever experiments to settle it, and ended up with an answer nobody expected: it's both, and neither, depending on how you look. We trace that argument and what it revealed about the deep grain of reality.

You'll come away understanding why the famous double-slit experiment is so unsettling, what a photon actually is, how the colours you see are just a thin slice of a vast spectrum, and why “wave-particle duality” is less a paradox than a hint about how the universe really works.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: Feynman's QED: The Strange Theory of Light and Matter; NASA “Tour of the Electromagnetic Spectrum”; the Royal Institution lectures on light.

Every carbon atom in your body has been around for billions of years, cycling endlessly between air, oceans, rock and living things. Understanding this carbon cycle is the key to understanding both why Earth has stayed livable for so long and why burning fossil fuels is such a profound disruption. We follow a carbon atom on its journey through the planet's great cycles — the fast biological loop and the slow geological one.

You'll come away understanding where carbon is stored and how it moves, why the ocean is doing us a quiet and costly favour, how the cycle self-regulated Earth's climate over deep time, and precisely what fossil fuels do to break the balance.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: NASA Earth Observatory “The Carbon Cycle”; NOAA carbon cycle resources; Royal Society “Ocean Acidification” briefing.

Cancer isn't one disease but hundreds, and at its root it's a problem of control: a cell that stops obeying the rules that keep a body working as a team, and starts dividing when it shouldn't. We explain what actually goes wrong inside a cancer cell, why it's fundamentally a disease of our own genes, why it becomes more likely as we age, and what modern treatments are really trying to do.

You'll come away understanding the difference between a benign lump and a malignant one, why cancer is so hard to cure, how mutations accumulate, and why immunotherapy represents a genuinely new way of fighting it. This episode is a general explanation and isn't medical advice.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: Cancer Council Australia; the US National Cancer Institute (cancer.gov); The Emperor of All Maladies by Siddhartha Mukherjee.

Right now, without any conscious effort from you, an enormous distributed defence network is identifying and destroying threats inside your body. We look at how your immune system tells self from invader, why it remembers infections for decades, and what happens when this beautifully engineered system turns on the body it is meant to protect.

You'll come away understanding the difference between innate and adaptive immunity, why boosting your immune system is mostly a marketing phrase, and how allergies and autoimmune disease are the same machinery misfiring.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: Immunobiology (Janeway); British Society for Immunology public resources; Nature Reviews Immunology.

The periodic table isn't a list, it's a map, and once you can read it, it predicts how elements behave before you ever test them. We look at how Mendeleev arranged it while leaving gaps for elements nobody had found, why the rows and columns mean what they mean, and what actually happens at the strange, unstable bottom edge.

You'll come away understanding why elements in the same column behave alike, what makes the noble gases so aloof, and why there is a hard limit on how many elements can exist.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: Royal Society of Chemistry periodic table; IUPAC element data; The Disappearing Spoon (Sam Kean).

Volcanoes are the only direct route we have from the surface into the Earth's interior. We look at why some erupt as gentle rivers of lava while others detonate with the force of nuclear weapons, what actually drives an eruption, and how a single volcano can change the global climate for years.

You'll come away understanding why magma composition determines everything, what a supervolcano really is, and why the deadliest volcanic hazard is usually not the lava.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: Smithsonian Global Volcanism Program; USGS Volcano Hazards Program; Geoscience Australia.

The Moon is so familiar we barely look at it, but it is genuinely peculiar, far too large for a planet our size, and we are fairly sure it exists because something the size of Mars hit the young Earth. We look at the evidence for that collision, how the Moon drives our tides, and the argument that without it, Earth might be a much less hospitable place.

You'll come away understanding why the Moon always shows us the same face, why it is slowly drifting away, and what it stabilises about our planet.

Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au

Further reading: NASA lunar science; Lunar and Planetary Institute; Apollo sample analysis summaries.