Chalk produce, and thus widely used in the developing world, calcium-based chalk can be made where the crumbling particles are larger and thus produce less dust, and is marketed as "dustless chalk". Colored chalks, pastel chalks, and sidewalk chalk (shaped into larger sticks and often colored), used to draw on sidewalks, streets, and driveways, are primarily made of gypsum. Chalk is a source of quicklime by thermal decomposition, or slaked lime following quenching of quicklime with water. In southeast England, deneholes are a notable example of ancient chalk pits. Such bell pits may also mark the sites of ancient flint mines,
What Are Little Boys Made Of? a episode titled What Are Little Girls Made Of? was released, describing the culmination of Nurse Chapel's search for her fiancée (Korby), and the discovery of his plans for conquest. The nursery rhyme's notion of the composition of girls was the inspiration behind the Cartoon Network original series "The Powerpuff Girls", in which Professor Utonium creates the Powerpuff Girls by adding together sugar, spice, and everything nice (and Chemical X by mistake). In the same show, Mojo Jojo gathers the snips and snails and a puppy-dog tail and flushes them down a toilet to create the Rowdyruff Boys. It also