About this episode
Hannah Fry explores two tales of data and discovery.
Two couples are brought together by a tragedy and a tatty piece of paper, which reveals a serial murderer hiding in plain sight.
And, across the world in Singapore, a metro system is misbehaving wildly. The rail engineers and company officials are flummoxed. Can data save the day?
Produced by: Ilan Goodman and Lauren Armstrong Carter
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