The Scotsman reports on this frightening development:SCIENTISTS have been stunned by the discovery of a shark that had eaten a polar bear.Part of the jaw of a young polar bear was found in the stomach of a Greenland shark in Svalbard, northern Norway.Kit Kovacs, of the Norwegian Polar Institute, said: "We've never heard of this before."We don't know how it got there. We can't say whether or not the shark took a swimming young bear or ate a...