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'There's something absolutely unknowable in the universe'

According to the scientific journal Nature, 'a paradox at the heart of mathematics makes basic questions about matter unanswerable'. Some physicists are getting excited, but what does it mean and does it matter if there are questions that can not and never will be answered? Science commentator Roland Pease explains

Picture of the moon. (Credit: ÃÛÑ¿´«Ã½)

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3 minutes