Artist impression of a large asteroid impacting on Earth such as the Chicxulub event that caused the end-Cretaceous mass extinction, 66 million years ago. The illustration shows an asteroid impacting at Chicxulub. Shown in the background are planet Mars and asteroid bodies. Credit: Illustration by Mark Garlick An intense debate surrounding the cosmic rock that
Credit: Pixabay/CC0 Public Domain Many cat owners are familiar with torn cushions, carpets, and couches. The feline instinct to scratch is innate, but is often perceived as a behavioral problem by cat owners, and sometimes leads to interventions that are not cat-friendly. Now, an international team of researchers has investigated which factors influence undesired scratching
Digital reconstructions of endocasts of a woodpecker, Melanerpes aurifrons (top), and a troodontid dinosaur, Zanabazar junior (bottom). The blue area is the cerebellum. Credit: Amy Balanoff Evolutionary biologists at Johns Hopkins Medicine report they have combined PET scans of modern pigeons along with studies of dinosaur fossils to help answer an enduring question in biology: