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Numbers of the Year 2015 Part 2
How healthy is the Nigerian economy and how many possible tweets are there? Tim Harford looks back over some of the numbers that made the news in 2015.
(Image: Nigerians check their ballot station positions in Yenagoa. Credit: Getty Images)
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Mon 4 Jan 201614:50GMT
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Tim Harford explains the numbers and statistics used in everyday life
