A horse's signature whinny comes from a combination of whistling and singing. The whinny is a unique combination of both high and low pitched sounds. The low tones come from vibration of tissue in the voice box. But what about ... .
PM 2.5 air pollution directly inflames the brain, spikes beta-amyloid plaques and increases dementia risk by 4% per 2 ?g/mÂ179; exposureâdebunking ... .