NASA's twin Mars rovers continue to turn up intriguing new rock formations after a combined total of nearly 1120 Martian days on the planet. After discovering relatively little, other than basaltic lava flows, during its first six months on the Red Planet, Spirit continues to make up for lost time as it ascends Husband Hill - unearthing clues to violence in the planet's youth. Meanwhile, Opportunity is also experiencing a reversal of fortune on the other side of Mars. After trudging over desolate stretches of sand for about five months, it has finally reached an island of bedrock that appears...