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Most homes don’t have builder plaques or dated cornerstones, but you might be able to make an educated about the age of a home with a bit of background information. In this issue, pick up some tips for “aging” a home post-fire.

Special Report: Origin Determination Primer
The process of determining a fire’s origin can be time-consuming and often requires a great deal of thought and organization. Editor Jack Sanderson walks you through a systematic, scientific approach to this essential component of fire investigation.

How it Works: Spa Systems
Spas, often called hot tubs, appear quite simple, but their design and function have become more elaborate over the years. Learn about their component parts, how they work and some failure scenarios.

NFPA 921: Fire-related human behavior
Human behavior during fires is a fascinating area of study, but NFPA 921 advises the analysis of peoples’ actions during a traumatic event is no substitute for a thorough investigation. Find out why.

What’s Inside: Infinite control switch
The basic operation of a control for a heating element of an electric range, more properly called an infinite control switch, entails cycling power to the heating element to achieve a desired temperature at the burner. Learn about the various parts inside the switch that make it operate.

And, in every issue:
Fast Facts • Something for Nothing • Reviews • In-Court Tips • Product Recalls and Manufacturer Problems • Techniques • Site Surfing

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