Your eyes just can't see all 12 back dots at the same time. http://pic.twitter.com/d4T3m6tL5f
— Max Roser (@MaxCRoser) September 12, 2016
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Your eyes just can't see all 12 back dots at the same time. http://pic.twitter.com/d4T3m6tL5f
— Max Roser (@MaxCRoser) September 12, 2016