Grundlagen der Umweltchemie. 1. Stunde 13. Oktober 2021

New channel Michael Schmitt: title sample judged 'pick' (Mostly genuine university lectures and lab demonstrations on physical/environmental chemistry, but some entries are gues); 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.