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Vibrant, tiny, and sporting a bright red grin on its back, the Happy-Face spider is one of the most famous and recognizable arachnids in the world. For over a century, this cheerful-looking creature ...

Viral social media posts claiming a celestial "smiley face" will appear on Christmas are false. The "smiley face" illusion is an optical effect caused by the alignment of a crescent Moon and two ...