US scientists have amassed "planetary-scale" data from people's smartphones to see how active we really are.
More on the BBC website.
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Do you live in the world's laziest country?
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By Heba Kassoua
Presented by مرحبا أستراليا من 4-7 بتوقيت سيدني وملبورن من الاثنين وحتى الجمعة
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