Quick, how many apples are in the photo above? It's easy to see there are three, but thanks to a distinct processing mechanism in your brain, it might have been even easier than you realize.
The Numbers Four and Five Do Very Different Things to Our Brains theatlantic.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from theatlantic.com Daily Mail and Mail on Sunday newspapers.
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