The science lessons are short "omake" bonus features originally present on the first two volumes of the original release. Each short lasts around two minutes, and stars super deformed versions of Noriko, Kazumi and the Coach explaining the various scientific aspects of the series.
Up to EP 12C³ - CubexCursedxCuriousAnime
Up to EP 1Haiyore! Nyaruko-san FAnime
Up to EP 1The Girl Downstairs ExtraAnime
Up to EP 1Godzilla: City on the Edge of BattleAnime
Up to EP 12Sayonara Zetsubou SenseiAnime
Up to EP 1Fairy Tail the Movie: The Phoenix PriestessAnime
Up to EP 1Hoshizora no ViolinAnime
Up to EP 13Love Live! School Idol ProjectAnime
Up to EP 1Boruto: Naruto the MovieAnime
Up to EP 11Re:ZERO ~Starting Break Time From Zero~Anime
Up to EP 1Yawara! Sore Yuke Koshinuke Kids!!Anime
Up to EP 24Steins;GateAnime