Air Pollution Lesson 07B: Reflecting Hazardous Area

New channel John Cimbala: title sample judged 'pick' (Overwhelmingly rigorous engineering/fluid-mechanics course content from a professor, but a small number of Bible-reading); passed a second screen for sellers/exam-prep/re-uploads; 3 of 3 sampled transcripts showed teaching, 0 not; titles picked one by one, checked strictly; oEmbed verified.