In 2002, digital storage surpassed non-digital storage for the first time, according to Martin Hilbert and Priscila Lopez.

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However, I am not so sure that Priscila Machado was a poor girl, at least not by Brazilian standards of poverty.

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Since Priscila Leite and Isabella Velletri set up Homestaff, a domestic-employment agency, three years ago, they have been contacted by 5, 000 would-be mistresses and have been able to find staff for 650.

ECONOMIST: Domestic labour