fter moving 400 yards an hour on an ice floe at the top of the world for three days, Science Writer Andrew Revkin looks down from a helicopter. He watches the icy expanses recede far below while he weighs questions and answers about global warming, and the challenge of presenting these to young readers who are often lured in other directions by iPods & computer games. Tomorrow's scientists need to be 'shook up' and know there are still discoveries to be made; they can be the ones inventing new techniques needed to retrieve & examine rock core samples from deep below the ice. (See pictures on page 66). They can be detectives competing with the changing ice for answers to frustrating puzzles about the rising seas, for example.