Go Figure: The week in numbers

Look back at the week in numbers with our Go Figure images, which are posted daily on social media.

Monday: The father of email dies at 74

Tuesday: Google AI takes on the 'world's Go champion'

Wednesday: The Hainan gibbon is the rarest primate in the world

Thursday: Grim record for rhino poaching

Image copyright Reuters

Friday: Silence honours Japan tsunami victims

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