Look for life in pools of water in the polar regions of Mars, say scientists. Liquid water is the key for life, they say, but over most of Mars the atmospheric pressure is too low for water to exist in that state. Now, an assessment of all the available satellite data suggests that there may be pools of open water at the poles, or small lakes just under the ice. A research project is already underway that will gather as much information as possible on Mars’ polar regions, and look for lakes so that future landers can be targeted on them.