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Intro music.

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NASA's Spirit and Opportunity Rovers could tell you something about the ups and downs of working on Mars.

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Spirit is in the high ground at the Columbia Hills. It's examining a rock called "Pot Of Gold" before it begins its climb up the martian mountains.

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"Pot Of Gold" shows signs of hematite, a mineral that means water may have been in the area sometime in the distant past.

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That's the same mineral that Opportunity studied in Gusev Crater, but this is the first time Spirit has seen it.

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"We're into totally new stuff in both places, and it's fairly wild."

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Opportunity is headed down into Endurance Crater and is looking at each layer of rock as it gets deeper.

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Scientists say the farther down that the rover finds traces of salt, the more water that flowed over the region in the past.

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