E. Klein, comment la physique quantique est-elle née ? 2/6

New channel pkpdlm: title sample judged 'pick' (Mostly genuine lecture/conference clips (Klein, Guillemant, Viguier law lectures) but mixed with some fringe pseudoscien); 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.