Graphite

Melissa and Jam examine how erasers remove graphite from paper. The episode connects the structure of graphite with the polymers and physical interactions that let an eraser lift a mark, contrasting absorption and adsorption and discussing what makes an everyday material effective for this purpose.

Melissa and Jam explain why graphite makes pencils useful for writing. The discussion follows carbon bonding into graphene sheets, conductivity and the weak interactions between layers, then connects these structures with paper, pencil hardness and clay mixtures.