This is one of smallest OS over the world and you can use it for learning basics of computer to your children or students.
This OS needs to 8 MB RAM and it’s very very small but has most abilities of a modern OS. Also it has a friendly GUI and has some useful applications such as viewers and editors. This OS supports read and write on FAT/FAT16/FAT32 and read NTFS partitions.
You can download live and installable image for this link: http://kolibrios.org/en/download
See some screen-shots from this OS:
