SUMMARY: An instrument on board NASA's Spirit rover has detected warm air thermals rising off the surface of Mars; the first time this has been seen on the Red Planet. Thermals on Earth work to create wind, so by analyzing the temperature and speed of these thermals, it will better help scientists understand wind dynamics on Mars. On the other side of the planet, Opportunity has found unusual blueberry-shaped formations in the soil, and scientists are studying them to understand the soil's development.

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