Entomologists study insects and spiders. They regularly discover examples of mathematical genius hardwired into various tiny-brained arthropods. And as young students know all too well, math doesn't come easy.

Being the first ever to examine a dinosaur fossil long buried in sedimentary rock is thrilling enough for a field researcher. But a team working in Canada found an exhilarating bonus on a hadrosaur fossil fragment—it had actual skin still attached.