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Tim Harford explains the numbers and statistics in the news and in life

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Billy Vunipola reaches for a rugby ball.

18/09/2015 GMT

The Rise of the Giants?

BBC World Service - More or Less, The Rise of the Giants?

Are rugby players getting bigger and bigger?

Are rugby players getting bigger? And, are sea life populations plummeting?

The average rugby pack is much bigger than it was 20 years ago but has the growth finally plateaued? 

Living Blue Planet Index
A report says populations of marine mammals, birds, fish and reptiles have declined by 49% since 1970, but what does this actually mean?

(Photo: England's number eight Billy Vunipola looks at a ball. Credit: AFP/Getty Images)

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