Calcium sulfate an unusual property: when mixed with water at normal (ambient) temperatures, it quickly reverts chemically to the preferred dihydrate form, while physically "setting" to form a rigid and relatively strong gypsum crystal lattice: This reaction is exothermic and is responsible for the ease with which gypsum can be cast into various shapes including sheets (for drywall), sticks (for blackboard chalk), and molds (to immobilize broken bones, or for metal casting). Mixed with polymers, it has been used as a bone repair cement. Small amounts of calcined gypsum are added to earth to create strong structures directly from cast earth, an
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