Time for a little reality check. It seems like almost every day there's a piece of news about how "research suggests there were once oceans floating in the vacuum of space!" or "life could have once existed at the center of the Sun!" You know, we all get a little over-excited sometimes. Well, geochemist Nicholas Tosca of Harvard University put a damper on our enthusiasm yesterday when he calculated that early oceans on Mars were between 10 and 100 times more salty than seawater here on Earth. Even worse, they were probably highly acidic. But pro-Mars life scientists aren't giving up without a fight, After the break, some hopeful scientists speak out on why following Mars' ancient water supply could still lead us to the aliens.