It's the last week before Christmas and not a creature is stirring, not even a mouse model bred to exhibit characteristics of ADHD for in vivo studies of central nervous system stimulants. This week, we reported on the discovery of the world's oldest-known mammalian ancestor; the surveying of 1,300 burial mounds in western Azerbaijan; and a quasiparticle present in all magnetic materials. Additionally, researchers have shut down another alternate theory about the end of the dinosaurs; LLMs are becoming more brain-like, according to one study, but another one suggests that they exhibit signs of cognitive decline: