The Mars rover Curiosity has turned up something that is indeed curious. Scientists studying images of "stones cemented into conglomerate rock" have opined that the formation is evidence of a stream flowing at about 3 feet per second. The estimate of the stream's depth ranges "somewhere between ankle and hip deep", according to Curiosity science co-investigator William Dietrich, of UC Berkeley. A rock outcrop near the stream bed has been named Hottah, after Hottah Lake in Canada's Northwest Territories.
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