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What is 'Planet Nine'?

Egocentric people also have trouble with self-control

Quantum artificial intelligence could lead to super-smart machines

There are 10 times more galaxies in the universe than previously thought

Spiders can hear you from across a room

The supermoon: 4 things to know

Nearest Earth-like exoplanet might be an ocean world

Test your Nobel knowledge

Orange peels and avocado skins are 16-year-old's brilliant, drought-fighting solution

World's largest telescope now ready to receive messages from E.T.

Bumblebees can be optimistic, study finds