David Michaels is professor of environmental and occupational health at the George Washington University Milken Institute School of Public Health. He served as Assistant Secretary of Labor for the Occupational Safety and Health Administration (OSHA) under President Barack Obama from 2009 to 2017.
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This is the Final Test!!! If you pass, then you are an advanced English speaker. We thought long and hard about how we could properly test your English at an advanced level. In the end we decided the only way to do it was to just record people speak... SEE MORE