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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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Spirituality
Trek alongside spiritual pilgrims on a treacherous journey across Pakistan
6 minutes
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Thinkers and theories
Photographs offer a colonialist window to the past – one that must be challenged
14 minutes
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Meaning and the good life
The world turns vivid, strange and philosophical for one plane crash survivor
16 minutes
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Art
Inside the unique creative space where ‘outsider’ artists find their form
14 minutes
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Gender
When aggression is viewed as brilliance, it hurts women in science, and science itself
5 minutes
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Religion
From God’s shoes to satellites in heaven – children weigh in on religion
8 minutes
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Stories and literature
Myths from Earth’s edge – what the Icelandic sagas reveal about Norse morality
57 minutes
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Technology and the self
Why we should worry less about ‘sentient’ AIs and more about what we’re teaching them
16 minutes
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Art
Why European artists shifted their focus from power to peasants in the 16th century
5 minutes