The science lessons are short "omake" bonus features originally present on the first two volumes. 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)+ More
Characters & Voice Actors
Recommended for you
Those Who Hunt Elves II
TV
24m
Jarinko Chie
Movie
109m
Akazukin Chacha OVA
OVA
24m
Blue Seed
TV
23m
Galaxy Angel
TV
13m
Hataraki Man
TV
21m
Kamen no Maid Guy
TV
25m
The Wind Guardians
Movie
105m
Gravitation
TV
22m
Jungle no Ouja Taa-chan
TV
24m
Negima!? Magister Negi Magi
TV
23m
Blue Submarine No. 6
OVA
32m
Classroom☆Crisis
TV
24m
HeatGuy J Special
Special
25m
The Guyver: Bio-Booster Armor
OVA
25m