In fiction, a MacGuffin (sometimes McGuffin or maguffin) is a plot device in the form of some goal, desired object, or another motivator that the protagonist pursues, often with little or no narrative explanation. The MacGuffin's importance to the plot is not the object itself, but rather its effect on the characters and their motivations. The most common type of MacGuffin is a person, place, or thing (such as money or an object of value). The MacGuffin technique is common in films, especially thrillers. Usually, the MacGuffin is revealed in the first act, and thereafter declines in importance...

The Fire Triangle or Combustion Triangle or ″Fire Diamond ″ are simple models for understanding the necessary ingredients for most fires. The triangle illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen). A fire naturally occurs when the elements are present and combined in the right mixture, meaning that fire is actually an event rather than a thing. A fire can be prevented or extinguished by removing any one of the elements in the fire triangle. For example, covering a fire with a fire blanket removes the oxygen part of the triangle and can...