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 10Ushio and ToraAnime
Up to EP 13Code:BreakerAnime
Up to EP 15Blades of the GuardiansAnime
Up to EP 4Tales of Symphonia The Animation: Sylvarant-henAnime
Up to EP 1Sayonara Zetsubou Sensei SpecialAnime
Up to EP 1Fairy Tail the Movie 2: Dragon CryAnime
Up to EP 5Oh! My GoddessAnime
Up to EP 13Love Live! School Idol Project 2nd SeasonAnime
Up to EP 13The Morose Mononokean IIAnime
Up to EP 12Wish Upon the PleiadesAnime
Up to EP 1My Hero Academia: Two Heroes SpecialsAnime
Up to EP 1Gundam Build Divers PrologueAnime