Of all the mysteries surrounding dinosaurs, none has sparked more debate than how their era ended—was it a gradual decline or a sudden catastrophe? A new study led by Andrew Flynn of New Mexico State University delivers one of the clearest answers yet: dinosaurs in what is now New Mexico were thriving right up until the asteroid impact that ended their reign. A World on the BrinkPublished in the journal Science, the research focused on the Naashoibito Member of the Kirtland Formation in northwes