Are Aliens Among Us?

This is a very interesting article from Scientific American on the idea that there may already be aliens living on earth, although as a fanboy you may be let down that E.T. is the size of bacteria:

Are Aliens Among Us?
In pursuit of evidence that life arose on Earth more than once, scientists are searching for microbes that are radically different from all known organisms

“No planet is more Earth-like than Earth itself, so if life does emerge readily under terrestrial conditions, then perhaps it formed many times on our home planet. To pursue this tantalizing possibility, scientists have begun searching deserts, lakes and caverns for evidence of “alien” life-forms—organisms that would differ fundamentally from all known living creatures because they arose independently. Most likely, such organisms would be microscopic, so researchers are devising tests to identify exotic microbes that could be living among us.”

…although this idea been brought up before. There’s also an interesting article on mysterious bacteria found in India in 2001 which some scientists conjectured that it might be an alien life form.