When icebergs break off into the polar seas, scientists usually have to work backwards to figure out why--they try to piece the clues together to figure out what caused an event that already happened. But in March, NASA scientists were able to follow the wake of the Japan tsunami over 8,000 miles, through the Pacific and Southern Oceans, until it snapped off several icebergs from Antarctica--icebergs that together are about as big as not one but two Manhattans (the island, not the drink).