Has materialism won the day? George Ellis takes a philosophical look at why what exists is not only physical.
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The fundamental problem of philosophy, argued Heidegger is 'why is there something rather than nothing?' . Now, some scientists claim nothing doesn't existand even the deepest space is full of virtual particles. Have we misunderstood the very idea of nothing? Is this little more than a logical mistake, or might understanding nothing just be the key to explaining the universe?
George Ellis: Templeton prize winner and cosmologist, Ellis has been awarded the Order of the Star of South Africa by Nelson Mandela and is an expert on relativity.