NASA scientists made history on Monday when they landed a probe on Mars.<br /><br />Part of the project's task is to look for any evidence that life has ever existed on the planet.<br /><br />Now scientists in California are looking for life in an entirely different way.<br /><br />And tens of thousands of enthusiastic would-be alien seekers have signed up to help.<br /><br />Al Jazeera's Rob Reynolds reports from Mountain View, California.
