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The astonishing fireball cloud was seen over Portugal this week
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They hunt by shooting bubbles at fish
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In the core of a star, matter is transformed into energy
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The Greek philosopher Aristotle figured it out
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A warmer world means no more blizzards, right?
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How quasars became so impossibly luminous
Unmissable Stories
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One creature can survive for millennia in the so-called 'Sea of Death'
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They have left a powerful legacy in our genes