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 Before Pluto was demoted, astronomers were struggling to define what a planet is
Do you think Pluto should remain a planet?
 The search for alien life is 50 years old, but a planet has been discovered that could support life.
Prof. Regan tests the scientific claims of supermarket products
A few isolated communities seem to hold the secrets to long life.
Lifting the lid on the business of human choices in an exclusive guide to making better decisions.
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  Comprehensive guide to Pluto
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