A woman examines colouring books in Sao Paulo, Brazil. More than a million such books have been sold in the country. Photos: AFP, AP

Why adult colouring books are here to stay and how they relieve stress

You'll have seen them piled high in bookshops: adult colouring books are a phenomenon - and some say they are good for your health

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A woman examines colouring books in Sao Paulo, Brazil. More than a million such books have been sold in the country. Photos: AFP, AP
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