Mixing Experiment 1: the dyes don't mix

New channel GeoOceanology: title sample judged 'pick' (Mostly genuine university lectures and tutorials on oceanography/geochemistry, but mixed with a few non-teaching items l); passed a second screen for sellers/exam-prep/re-uploads; 0 of 3 sampled transcripts showed teaching, 0 not; titles picked one by one, checked strictly; oEmbed verified.