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 Planet Are You From? What Planet Are You From? What Planet Are You From? is a 2000 American science fiction comedy film directed by Mike Nichols and written by Michael Leeson, Garry Shandling, Ed Solomon, and Peter Tolan based on a story by Leeson and Shandling. The film stars an ensemble cast featuring Shandling, Annette Bening, Greg Kinnear, Ben Kingsley, Linda Fiorentino, and John Goodman. A denizen (Garry Shandling) of a faraway planet occupied only by highly evolved males is ordered by his superior, Graydon (Ben Kingsley), to find a female human, impregnate her and bring the baby back to the planet. The visitor