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Nasa's Phoenix landed successfully on Mars and will start investigating the surface soil and looking for water. The next generation of landers was put through their paces at the Robot Challenge in California. How the World Science Festival in New York was created by String Theorist Brian Greene and actor Alan Alda. The first inhabitants in Greenland and northern Canada have been found to be descended from an Asian population from the Aleutian Islands. Plus, the Chelsea Flower Show garden of the future, and improving sugar cane for biofuel in Brazil.