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

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 6:56pm3/08/12 6:56pm