Could alien life be already here on Earth?

This is from MSNBC News:

LONDON - For the past 50 years, scientists have scoured the skies for radio signals from beyond our planet, hoping for some sign of extraterrestrial life. But one physicist says there's no reason alien life couldn't already be lurking among us — or maybe even in us.

Paul Davies, an award-winning Arizona State University physicist known for his popular science writing said Tuesday that life may have developed on Earth not once but several times.

Davies said the variant life forms — most likely tiny microbes — could still be hanging around "right under our noses — or even in our noses."

"How do we know all life on Earth descended from a single origin?" he told a conference at London's prestigious Royal Society, which serves as Britain's academy of sciences. "We've just scratched the surface of the microbial world."

The idea that alien micro-organisms could be hiding out here on Earth has been discussed for a while, according to Jill Tarter, the director of the U.S. SETI project, which listens for signals from civilizations based around distant stars.

She said several of the scientists involved in the project were interested in pursuing the notion, which Davies earlier laid out in a 2007 article published in Scientific American in which he asked: "Are aliens among us?"

Of course the aliens are among us. You just have to look here;



I'll admit that I was first going with the 1956 movie trailer, but I think I like the 1978 trailer even better. Both are great science fiction movies.