and result to severe spread to the diseases. scientists at institutions across the world are doing further tests that add to the analysis. claire cook is a mineralogist at the university of sheffield in the u k. she leads in a bar a tree studying soil and dust particles but if not now is the dust and a scanning electron microscope and not a minute when my can find flight three hundred times faster the scalp on this image is fifty microns roth s and suit these principles really really very smoothly that s an individual one but they also will marry all together. in big clumps so you can see there s a whole different distribution of sizes some of them very small and some of. the chemical elements can also be identified by the microscope ok so this is all elements who might have been in the dust some just a night out to have