Headline News International News people Debate / Hot Issues Sports Opinion/Column Unique story Periscope Entertainment National News World News English Letters Amazing News Science Special Focus Think & Talk People Animals National News World News Photo News People What's New Health New Words Picture Vocabulary Focus Fun Facts World Culture	41 What Is Blood? 23-02-2008 40 Why Is It Hot in Summer & Cold in Winter? 16-02-2008 39 What Is a Black Hole? 09-02-2008 38 How Old Is the Earth? 01-02-2008 37 Interesting Facts about the Moon 25-01-2008 36 What Causes Typhoons? 18-01-2008 35 What Are Shooting Stars? 11-01-2008 34 What's Color Blindness? 04-01-2008 33 What Is a Gene? 28-12-2007 32 Why Does Your Skin Wrinkle in water? 21-12-2007 91 92 93 94 95 96 97 98 99 100