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Mountain or valley? Concave or convex? Why is it so difficult to tell the difference when you’re viewing a surface from directly overhead? This short animation from MinutePhysics details how this perceptual illusion is explained by our natural conditioning to the Earth’s most powerful light source – the Sun – which has trained us to perceive light as always being on top and shadows as always being on the bottom.
Video by MinutePhysics
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Philosophy of mind
Do we have good reasons to believe in beliefs? A radical philosophy of mind says no
5 minutes
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Space exploration
In the search for life, might alien ocean worlds be a better bet than Earth-like planets?
5 minutes
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Love and friendship
When drawing your muse hundreds of times becomes an exercise in love
7 minutes
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Thinkers and theories
Is simulation theory a way to shirk responsibility for the world we’ve created?
13 minutes
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Biology
A dazzling slice-by-slice exploration of wood exposes hidden patterns and hues
2 minutes
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Family life
In Rwanda, Sébastien finds traces of personal history in the wake of national tragedy
21 minutes
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Love and friendship
A decade after his wife was swept away in a tsunami, Yasuo still searches the sea
9 minutes
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Architecture
Modern architecture should embrace – not ignore or repel – the nonhuman world
8 minutes
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Philosophy of mind
We may never settle the ‘free will’ debate, but tapping into it is still worthwhile
32 minutes