Trillian and Samantha are children growing up in a world far different than our own. They live in a world where the Gems have been used to augment people's mental capabilities.  If you want to increase your mental capabilities simply have the gemstone helm installed and augment whichever faculty you want to increase. But beware if your gemstone is ever used up or removed your will become Glass and your augmented attribute will drop far below the capabilities of a normal human. [participant in the Royal Road Writathon challenge]