Is there life on Mars? If we find both water and methane we could start thinking it slightly possible. The Mars Rover "Curiosity" has discovered that:
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vote
a. 2% of martian soil is water
b. There is no water on Mars
c. There is no traceable sign of methane in Mars atmosphere
d. There is lots of methane
e. There is 2% water, but no methane
f. There is 2% water and methane - life on Mars is possible!