Mars
Something big collapsed this week — again. Do you know what? Take our quiz
This week, we had news of a drawing that may or may not be the president's, and of a rock that may or may not indicate that Mars had life.
An Algerian scientist splits his gaze between microbes and Mars
Searching for small fossils in big rocks requires specialized tools --tools that scientists could also use to look for evidence of life on Mars in rocks that may be similar on both planets.
