The forward march of human knowledge has deepened our understanding of the universe and flung wide the floodgates of technological advance: we have established that the world came into being more than 4.5 billion years ago; we have deciphered the Rosetta Stone; travelled to the moon; eliminated smallpox and isolated the 'fat gene'. But in every domain of inquiry there remain a myriad things that we do not know, and which lurk tantalizingly beyond the bounds of our understanding. In The Things that Nobody Knows, William Hartston takes us on a guided tour of 501 gaps in our knowledge of cosmo
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