Utah's red rocks have yielded a rare skeleton of a new species of plant-eating dinosaur, Seitaad ruessi, that lived 185 million years ago and may have been buried alive by a collapsing sand dune.

The discovery confirms the widespread success of sauropodomorph dinosaurs during the Early Jurassic Period, researchers say. The finding is documented this week in PLoS One

People who stay mentally sharp into their 80s and beyond challenge the notion that brain changes linked to mental decline and Alzheimer's disease are a normal, inevitable part of aging, say scientists presenting at the ACS National Meeting.

The researchers say that elderly people with super-sharp memory — so-called "super-aged" individuals — somehow escaped formation of brain "tangles." The tangles consist of an abnormal form of a protein called "tau" that damages and eventually kills nerve cells. Named for their snarled, knotted appearance under a microscope, tangles increase with advancing age and peak in people with Alzheimer's disease.