What Brazil's billionaires show about wealth in a troubled country

This year, Brazil should be celebrating its world-power status. Instead its Olympics are in jeopardy, and the country is mired in corruption and endemic inequality – Alex Cuadros, the world’s first-ever ‘billionaire correspondent’ (for Bloomberg News), arrived in 2010 and spent five years there

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How Brazil's WhatsApp ban could come to the UK

End-to-end encryption means that only a message’s sender and its recipient can read its contents – and also means that WhatsApp has come under fire for leaving governments unable to access messages