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Is that a rat on Mars? A photo from the mast camera on NASA's Curiosity rover reveals the dusty orange, rock-strewn surface of the Red Planet -- and what starry-eyed enthusiasts claim is a dusty orange rodent hiding among the stones. The photo, taken Sept.

This could be a great article to discuss findings and allow students to develop supporting evidence. Maybe do this after the ecology unit so students have an understanding that if there is a highly complex organism on Mars, there must be a complex ecosystem to support it, including a food source and predators to keep the population balanced.