DENVER ‒ Lawsuits, rallies and pointed bipartisan questions are ratcheting up the pressure on the Trump administration to explain its growing cancellation of international student visas, forcing ...

Speaking and coughing produced droplets between 2 and 60 micrometers (μm) in size, the researchers found, while for normal breathing the droplet sizes were between 2 and 8 μm. As you would expect, ...

One home exceeded the World Health Organization's 24-hour limit for PM2.5 (particulate matter with a diameter of less than 2.5 micrometers) on nine days during the study period. "Our study shows the ...