"The evidence seems to be building that we are actually all Martians; that life started on Mars and came to Earth on a rock"

A controversial hypothesis contends that life on our planet had to get its start somewhere else — most likely on Mars, which may have looked like this billions of years ago — because the chemistry on early Earth couldn't have provided the required molecular machinery. More here:

http://www.nbcnews.com/science/we-are-all-mar...8C11026339