This four-winged dinosaur is helping rewrite the book on prehistoric…

What color were the dinosaurs? It's a question that people have puzzled over for close to 200 years, and one that many long believed to be unanswerable. But a few years ago, scientists discovered that microscopic structures called melanosomes could be used to reveal prehistoric creatures' true hues. » 3/08/12 3:56pm 3/08/12 3:56pm