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Fresh Water – The Coming Scarcity
Water covers most of the planet, yet the fresh water that farms, cities and ecosystems depend on is a startlingly thin slice of the total — and it's …
3 months, 1 week ago
Earth's Magnetic Field – The Invisible Shield
A compass needle swinging to point north is hinting at something enormous: our entire planet is a giant magnet, wrapped in an invisible field that re…
3 months, 1 week ago
Radioactivity – The Clock Inside the Atom
Radioactivity has a fearsome reputation, but at its core it's a natural process that's been happening since before the Earth existed — unstable atoms…
3 months, 1 week ago
Australia's Unique Wildlife – A Continent of Evolutionary Experiments
Australia is home to animals found nowhere else on Earth: mammals that lay eggs, marsupials that raise young in pouches, and a bewildering array of s…
3 months, 1 week ago
Semiconductors – The Material That Built the Modern World
Almost everything electronic you own runs on tiny switches carved into silicon — a material that is neither a good conductor nor a good insulator, an…
3 months, 1 week ago
Plastics and Polymers – The Miracle Material We Can't Put Down
Plastics are so useful, cheap and durable that they transformed the twentieth century — and so long-lasting that they've become one of the defining e…
3 months, 1 week ago
Rivers and Erosion – How Water Carves the World
Given enough time, a trickle of water can cut a canyon a kilometre deep. Rivers are the great sculptors of the land, patiently carrying mountains gra…
3 months, 1 week ago
Catalysts – Chemistry's Quiet Matchmakers
A catalyst is a substance that makes a chemical reaction go faster — often dramatically faster — without being used up itself, quietly making possibl…
3 months, 1 week ago
Biodiversity and Ecosystems
Nature isn’t just a random collection of plants and animals — it’s a vast web of connections in which everything depends on everything else. This epi…
3 months, 1 week ago
Gravitational Waves – Listening to Spacetime
A century ago, Einstein predicted that violent events in space should send ripples through the fabric of spacetime itself — and in 2015, after decade…
3 months, 1 week ago