OSC Colloquium: Stephan Schlamminger, "The Vexing Quest to Pin Down the Gravitational Constant"

New channel UA OSC: title sample judged 'pick' (Mostly substantive research colloquium talks and K-12 optics explainers that teach, but mixed with convocations, orienta); 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.