Cataloging 200,000 Alien Species Here on Earth

In our quest to discover alien life forms, humans have looked deep into space, sent landers to Mars. and launched probes into the outer reaches of the solar system. But marine biologists discover new life forms here on Earth all the time, many of them truly bizarre and as alien to terrestrial life as anything you'll… » 6/30/08 11:28am 6/30/08 11:28am