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“Always look on the bright side of life!” Which circle is lighter?

Fact Lab

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Continue with the IQ test afterwards
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Interesting fact:

Color is remarkable, listen to this: A factory in the United States decided to repaint its bathroom to a rather unpleasant green because they were boring or something. Anyway, this visual change saw productivity in the factory drop by 8%. Have nice colors in your damned toilets, people.