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How many black cabs are there in London?

Duration: 05:08

Johnny Ball is back, clipboard and calculator in hand, to estimate how many black cabs there are in London. He uses a simple but powerful technique called capture-recapture, developed by biologists studying animal populations.

Available since: Mon 2 Apr 2012


Series Producer
Paul King
Executive Producer
Tina Fletcher-Hill
Johnny Ball

This clip is from

Bang Goes the Theory Series 6, Episode 4

4/8 The team looks at the science of managing, predicting and understanding crowds of people.

First broadcast: 02 Apr 2012

Image for Episode 4 Not currently available on BBC iPlayer

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