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\section{Life and intelligence}  $f_l$ \textbf{How likely is the emergence of life}?   If life was impossible nobody would know it. Similarly the fact that we exist on Earth can not be used to draw conclusions on how probable is life in the Universe. Even if this probability was extremely low and life existed only on one planet in the Universe we would necessarily be on that planet.   The cool thing is that, statistically speaking, finding just another place where life can be supported changes everything. Finding traces of life (even fossil) on Mars or on one of the moons of Saturn or Jupiter would change completely the picture, as it would demonstrate that the emergence of life (biogenesis) does not require extremely unlikely conditions. \\