[빅 히스토리 교양강좌] 8. 에너지로 보는 빅 히스토리

New channel 물리학 산책: title sample judged 'whole' (Full-length structured physics and big-history lecture series with consistent, genuine course content and colloquium tal); passed a second screen for sellers/exam-prep/re-uploads; 3 of 3 sampled transcripts showed teaching, 0 not; every title checked strictly; oEmbed verified.