Look for the presence of matrix, crazing, pits, etc. Evaluate the opal’s cut: Consider the opal’s symmetry, thickness, polish, sizing and calibration. Opal hues can range across the spectrum. An opal ...

Traumatic brain injury (TBI) leads to increased rates of dementia, including Alzheimer’s disease. The mechanisms by which trauma can trigger neurodegeneration are increasingly understood. For example, ...