A generation or so after the great bones of dinosaurs had been discovered, men of science became engaged in a frenetic search to uncover more and more specimens of these great beasts who walked the earth uncountable millions of years ago. Two men, in particular, became well-known for their fossil-hunting exploits in the wild west of the 1870s. Their names were Othniel Charles Marsh of Yale University and Edward Drinker Cope from...