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Smiley face on Mars is a telltale sign of its pastMars didn't lose all its water without a fight. The planet, today 1,000 times drier than the driest desert on Earth, gradually lost its insulating atmosphere. The Red Planet's once great Martian ...
Challenge your observation skills with an optical illusion that hides a smiley face among a treasure box, a magic lamp, and an hourglass. Test your attention to detail and cognitive processing by ...
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