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 12The Mystic Archives of DantalianAnime
Up to EP 1Tokyo Ghoul: "Jack"Anime
Up to EP 24A Certain Scientific RailgunAnime
Up to EP 2Dragon CenturyAnime
Up to EP 24Honey and CloverAnime
Up to EP 1Aikatsu! Music Award: Minna de Shou wo MoracchaimaShow!Anime
Up to EP 11Inuyashiki: Last HeroAnime
Up to EP 12Prince of Stride: AlternativeAnime
Up to EP 56Rockman.EXEAnime
Up to EP 26Arc the LadAnime
Up to EP 20BeatlessAnime
Up to EP 13Horizon in the Middle of NowhereAnime