"In the 1880s, science witnessed a major shift: Charles Darwin proposed his theory of evolution. People dug up the first dinosaur fossils. And the field of paleontology--the study of ancient plants and animals--emerged. Othniel Charles Marsh and Edward Drinker Cope became enthralled with these new ideas, discoveries, and developments. Both were determined to become world-famous paleontologists. When they met in 1863, they started off as friends. But...