I would speculate that Curiosity found the four nucleotides of DNA in a single Martian sample. That wouldn't be all that thrilling in itself, because these nucleotides are also found in asteroids, but if the nucleotides were found in shocking amounts then that might suggest they are the product...
I have a few ideas...
I like the idea of a steampunk sort of colony. Almost every mine in the world is going to be taken over by refugees. Deep down, the Earth is hot, of course, from its formation and radioactive decay, so refugees are going to look to live in the Goldilocks zone of...