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What makes a firefly glow

The firefly is probably the Earth's most famous bioluminescent species, with over 2,000 individual species. Here's how they make their light.
What makes a firefly glow
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Why cities can’t get rid of rats

Chances are, if you live in a city, you've encountered one or two rats on your way home. Here's the reason why it's so hard to get rid of rats in cities.
Why cities can’t get rid of rats
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What’s inside the Mariana Trench

The Mariana Trench is the deepest point on Earth, void of light with the pressure of 48 jumbo jets. Yet life finds a way to survive. Very weird life.
What’s inside the Mariana Trench
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