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The Guardian - UK
The Guardian - UK
Science
Marcus Chown

RARE PHOTOS: Baffled by black holes confused by quantum theory explaining the universe one small step at a time | Rare Historical Photos

Everything you ever wanted to know about the universe – in bite-sized pieces.
Everything you ever wanted to know about the universe – in bite-sized pieces. Illustration: Martin O'Neill/The Observer

Evolution

Traits which enable organisms to compete successfully for scarce food resources and so survive to reproduce become more common with each successive generation

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