The discovery of the 3.7 billion-year-old fossil pushes back earliest life on Earth by 220 million years, raising chances that Mars once had life, when both planets were similar.
No one has found E.T. yet, but we may be getting closer.
Australian scientists say they've figured out why we've been unable to detect signs of alien life. And for those who dream of someday meeting up with a real-life E.T., it's a pretty depre ing reason....