Tooth growth patterns in fossils of the mouse-like Jurassic mammal Krusatodon show that it grew slowly and had a “surprisingly long” lifespan compared to mammals of similar size today.¹ A paper in Nature describes two “exceptionally complete” Krusatodon specimens, one an adult and the other a juvenile, that were found on Scotland’s Isle of Skye.² The fossils are dated at 166 million years old (Jurassic) by evolutionary reckoning.² In contrast, creationists think these fossils are only a few thousand years old and are the remains...