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If you tied a rope tight around the Earth’s equator and then added a single yard of slack, would the extra material make any noticeable difference to someone standing on the ground? Yes, actually. The answer comes as a surprise to most people, but the additional bit of rope raises it high enough off the ground for our eyes to easily discern it, and our feet to easily trip over. That fact might seem trivial, but the early 20th-century philosopher Ludwig Wittgenstein believed that this chasm between human intuition and physical reality revealed something important about the fallibility of our thinking. After all, if something that seems obvious to almost everyone can be totally false, what else might we be wrong about? This video from the Center for Public Philosophy at the University of California, Santa Cruz breaks down the mathematics behind Wittgenstein’s knotty example, and asks whether it should make us all feel a bit less certain about even our most deeply held beliefs.
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Food and drink
Local tensions simmer amid a potato salad contest at the Czech-Polish border
14 minutes
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Technology and the self
A filmmaker finds a tactile beauty in the creation of her prosthetic leg
11 minutes
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Knowledge
An Indigenous myth and a geological survey elicit two ways of knowing one place
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Technology and the self
How the magic of photography brought Victorian England closer to the spirit realm
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Neuroscience
Dog vision is a trendy topic, but what can we really know about how they see?
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Biology
An elegy for a dying microbe explores what we really mean by ‘death’
9 minutes
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Art
Creating art that was aware of itself – and the viewer – made Manet the first modernist
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War and peace
A century later, can poetry help us make sense of the First World War’s horrors?
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Language and linguistics
The little Peruvian guide to public speaking that conjures up a grandiose world
7 minutes