Scientists, as a rule, are not a giddy bunch. But evidence from the Mars Odyssey spacecraft of underground ice on Mars has astronomers tossing out descriptions like “stunning” and “amazing.” In a Perspective piece in this week’s Science magazine, Jim Bell, professor of astronomy at Cornell University, suggests these initial findings might just be the “Tip of the Martian Iceberg,” and that there may be large subsurface water ice deposits on our neighboring planet. He talked with CNN Science and Technology producer Marsha Walton…