The ""Age"" of Dinosaurs A woman takes her children to a museum of natural history. As they gaze with wonder at a skeleton of *Tyrannosaurus rex*, she asks a museum guide, a bright-eyed young fellow, ""can you tell me how old it is?"" The museum guide responds, ""well, ma'am, that particular skeleton is 65 million and 2 years, 4 months, and 25 days old."" ""Amazing!"" the mother replies. ""How can you know that so well?"" ""Well,"" replied the museum guide eagerly, ""when I started working here,…