Brain Problems Killed Knut

The mysterious and sudden death of polar bear sensation Knut is mysterious no longer. A necropsy performed yesterday discovered "significant changes to the brain, which can be viewed as a reason for the polar bear's sudden death," the Berlin Zoo announced today. The zoo wouldn't elaborate on what those changes were, but it did say that no changes were found in any other organ; further planned tests include bacteriological and tissue examinations. The AP notes that polar bears can live to as old as 20 in the wild, and even long in captivity; Knut turned four in December. (Click to read about the panic attacks Knut was having last year.)