It’s a pretty safe assumption that people have been born with birthmarks since humanity began, and between then and now we’ve come up with some wacky, even dangerous, explanations for them – even a few that survive still today. Learn all about them in this classic episode.

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Since the age of Descartes, science has put all of its eggs in the basket of determinism, the idea that with accurate enough measurements any aspect of the universe could be predicted. But the universe, it turns out, is not so tidy.

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It's a confusing part of climate change when it seems winter is as cold as ever, but as global temperatures creep ever so slightly higher, a cascade of catastrophic events will almost surely follow. The ball is in humanity's court.

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Like many huge discoveries, X-rays were accidentally stumbled upon. That serendipity led to a medical breakthrough still in use today. Learn about how X-rays are created and why they make such delightful images of our bones.

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You could be forgiven for thinking the story behind elastics was boring. You’d still be wrong, though. The story of what’s holding up your underwear is a global drama, replete with war, industrial espionage, colonialism, destitute inventors – everything!

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The world's energy consumption is ruining the planet but for decades physicists have been working on what could solve the world's energy and climate change woes for centuries to come - nuclear fusion. Learn about building stars on Earth in this episode.

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You know the rule that says the simplest explanation is probably the correct one? That’s called a razor and it’s meant to guide logic. But over time it’s become a broadsword used to disprove opposing arguments. Learn how to spot a faux skeptic in this episode.

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It’s easy to think of people in the distant past as kinda dumb for believing things like that mice could spontaneously generate from old grain. But if you look a little deeper, you’ll find there was a sensibility to the odd beliefs that came before science.

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