Which was the fastest, the biggest, the deadliest? Check out the greatest record breakers in history: the dinosaurs Dinosaurs ruled the Earth for millions of years--and they still rule the record books That's because they had to be extreme to survive in those prehistoric days. So meet the creatures that have never been equaled: Edmontonia, the spikiest dinosaur; Laellynasaura, with the longest tail ever; Therizinosaurus,...