Top wo Nerae! Kagaku Kouza
English title: Gunbuster! Science Lesson
Japanese title: トップをねらえ！科学講座
Type: Special
Episodes: 6
Source: Original
Genres: Comedy, Sci-Fi
Studios: Gainax
Duration: 2 min per ep
Rating: G - All Ages

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.

(Source: Wikipedia)