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Why can concave surfaces look convex when viewed from overhead (and vice versa)?
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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Knowledge
Why it takes more than a lifetime to truly understand a single meadow
11 minutes
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Physics
Groundbreaking visualisations show how the world of the nucleus gives rise to our own
10 minutes
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Earth science and climate
There’s a ‘climate bomb’ ticking beneath the Arctic ice. How can we prepare?
8 minutes
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Physics
To change the way you see the Moon, view it from the Sun’s perspective
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Technology and the self
A haunting scene from ‘Minority Report’ inspires a voyage into time and memory
7 minutes
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Family life
The stream-of-consciousness thoughts and memories that emerge while cooking a meal
5 minutes
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Ecology and environmental sciences
GPS tracking reveals stunning insights into the patterns of migratory birds
6 minutes
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Space exploration
The rarely told story of the fruit flies, primates and canines that preceded us in space
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Family life
The precious family keepsakes that hold meaning for generations
10 minutes