   neutral   What was it about?     neutral   Mars. Scientists say there might be water on it.  
    neutral   If so, we may live there someday.     neutral   I hope so. Did you know the US successfully sent two robotic explorers to Mars last month?  
    neutral   Sure. I heard about this on the TV. On January 3rd, 2004, Explorer Spirit landed near the so-called Guser Crater. And three weeks later, Spirit's twin explorer, Opportunity, landed on Meridian Planum named by scientists.     neutral   
 Have you ever watched a documentary on National Geographic or any other magazine? The reason why people are
 Have any further information?    happiness It is amazing! The news says, Both Ex