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What is 'Planet Nine'?

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How to see Orionid meteor shower at its peak

Dog portraits offer a look into canine souls

The 50 'rattiest' cities in America

Alligators found hunting and feasting on sharks

Scientists identify quantum material that mimics the brain's ability to forget

What food pyramids look like around the world

Why the skies over England turned a haunting shade of yellow

That huge helium deposit under Tanzania is even bigger than we thought

If certain foods make your mouth itchy, it could be oral allergy syndrome