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Counting Catholics

10 minutes
First broadcast:
Saturday 23 February 2013

This week Tim Harford asks how the figure of 1.2 billion Catholics world-wide is calculated. He also tests the claims of the controversial video, 'Muslim Demographics' shown at the Vatican by the Ghanaian Papal candidate Cardinal Peter Turkson.

(Image: Catholic worshippers holding rosary beads. Credit: Wathiq Khuzaie/Getty Images)



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