Tomáš Přibyl, Sergej Koroljov

New channel Hvězdárna a planetárium Brno: title sample judged 'pick' (Many substantial astronomy/science lectures qualify, but the channel also mixes in short promo clips, event announcement); 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.