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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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Family life
The precious family keepsakes that hold meaning for generations
10 minutes
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Neuroscience
This intricate map of a fruit fly brain could signal a revolution in neuroscience
2 minutes
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Information and communication
Coverage of the ‘balloon boy’ hoax forms a withering indictment of for-profit news
17 minutes
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Childhood and adolescence
Marmar is living through a devastating war – but she’d rather tell you about her new dress
8 minutes
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Meaning and the good life
Wander through the English countryside with two teens trying to make sense of the world
10 minutes
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Computing and artificial intelligence
The ‘cloud’ requires heaps of energy to stay aloft. Could synthetic DNA be the answer?
12 minutes
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Art
A puppeteer makes sense of an overwhelming world by shrinking it down to size
5 minutes
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Biology
Brilliant dots of colour form exquisite patterns in this close-up of butterfly wings
3 minutes
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Genetics
Why it took a century to work out that humans interbred with Neanderthals
22 minutes