Ponderações sobre a Braquistócrona

New channel Prof. César Lenzi: title sample judged 'whole' (A physics professor's channel overwhelmingly composed of structured video-lecture series (general relativity, mechanics,); passed a second screen for sellers/exam-prep/re-uploads; 2 of 3 sampled transcripts showed teaching, 0 not; every title checked strictly; oEmbed verified.